Should You Walk or Run When It's Cold?
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- Опубліковано 29 бер 2017
- Hi! My name is Henry, I make MinutePhysics, and you can support me on Patreon: / minutephysics
Is it better to walk or run when it's cold out? If you run, then you have to deal with wind, wind chill, etc, but your body generates more heat. If you stay still, standing or walking slowly, you don't generate as much heat, but don't deal with the wind. Note: the simple calculations in this video don't very well take into account the baseline metabolic rate/heat generation, even at rest, of humans.
REFERENCES
Physics of Running Presentation: uw.physics.wisc.edu/\~reardon/Physics%20of%20Running.pdf
Original Wind Chill Index formula: www.amazon.com/Factors-Design...
“The Basis of Wind Chill” paper: pubs.aina.ucalgary.ca/arctic/A...
Body surface area calculator: www.calculator.net/body-surfac...
Newton’s Law of Cooling: en.wikipedia.org/wiki/Newton%27s\_law\_of\_cooling
Boundary Layer: en.wikipedia.org/wiki/Boundary\_layer
MinutePhysics is on Google+ - bit.ly/qzEwc6
And facebook - / minutephysics
And twitter - @minutephysics
Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
Created by Henry Reich - Наука та технологія
"Mom, this guy on the internet told me to run naked through the snow"
"Don't forget to wear your jacket"
XAL and socks
Jornam "now i wont let you touch your phone and PC"
Your mom might get the wrong idea on what type of things you're watching on the internet
"This guy on the internet." Always a trustworthy person.
The correct answer: Stay inside and play video games.
PowahSlap Entertainmint or something else
PowahSlap Entertainmint fuck video games
please don't. genitalia isn't supposed to go there.
Floris Lans
Yeah, I mean seriously, this is getting
"Vidya games are gay"
So do cartridges and coding now have genders and the ability to be attracted to cartridges and codes of the same gender?
_THIS MAN JUST SEXUALLY HARASSED ME_ *DISGUSTING DISGUSTING*
But officer, I had to run through town naked, or I'd freeze to death.
lol
XD
I always choose the naked option
Love you doggie... .!
Lol
Mgs reference
🐶
@@dogodog1247 virgins are losers
if u didnt lose ur virginity by age 15 ur a degenerate
I think you should have at least mentioned that it is dangerous to sweat when in a cold environment and you are potentially in a survival situation. If you are running to stay warm and to get to your destination faster, then you are probably producing some sweat into your clothing. If this is the case, then you better make sure you make it to your shelter. If you cannot, then it would be a good idea to take your sweat soaked clothes and try to dry them in the air. Dampness against your body in a subzero environment is very dangerous because it risks hypothermia.
Actually, if you move at optimal speed, you'll not generate excess heat. You just have to make sure not to go too fast or too slow, and it'll be like a sunny spring day with a mild breeze to flutter your hair.
Except the part where you die of exposure eventually anyways.
I think that is easier said that done. And you may be starting to sweat and not even know it.
It's like 16°C in the room I'm currently in, and I bet I'm sweating at least from a couple pores on my body.
You might be wondering what I'm doing in such a cold room, but I don't have a reasonable answer. I don't know either.
Its 72 degrees in my room. So I'm either American or have developed super powers.
I think my room has a air temperature of just less than 300.
The closing line was perfect. Nice work Henry. :)
Oh, hello Jerry! I love your chess videos
You would have to run as fast as a passed pawn.
omg Jerry watches minutephysics!??
1:55 (tho' i personally liked the "Actually, snow changes all the calculations!" more ^^)
Did I just witness a physicist using 3 different speed units (minutes per mile, minutes per km and miles per hour) and none of them was m/s? wtf did happen to minutephysics?
UA-cam targeting. Runners and even those with basic knowledge on running/jogging would get a better idea of how fast that is with the minutes per km measurement, for example. m/s would not really be well for explaining because it's hard to imagine it without some reference to more practical things like running/jogging.
Their audience is not the experts on this subject, so they use whatever helps them get their point across better. At least that's my opinion in what seems to be the case.
Rič interesting point, although I believe Raizzor18 was trying to make a joke :-)
You bet it worked.
at least write the units correctly if you are going to be picky, thouigh its an interesting point ;)
Should have used rack-units per microfortnight.
How fast to run if it is hot outside and you wanna use evaporation too cool down?
Parameters we need to consider:
- surface area of the naked guy running
- humidity in the air around the naked guy
- inter-molecular forces of the sweat (salt water)
- pressure of the air around him (different in the Himalaya region)
- surface temperature of the skin
- air flow rate (depends on his running speed) which effects the humidity in the air around him
That's an interesting question. Humans are one of the few animals who can easily get rid of excess heat throughout transpiration. Dogs and horses can run faster, but humans can go on for miles in hot weather. This is how primitive humans hunted prey.
You're fucked if you're living in Montreal, canada, because it's humid af here and there's people and buildings everywhere
Christoph G. I thought you were joking
Finn the Mudfish same
This'll be super handy now that summer's about to start. :^)
Only for half of the globe.
Most people watching this video are in that half, and most of the southern hemisphere is pretty warm anyway
Fair enough.
There is a line where winter doesn't even coming
Unless you live in Australia.
Correct answer: Never go outside and watch UA-cam forever.
The PC Security Channel [TPSC] true
That is what I do
Lol 313 likes
You are so pathetic, just go outside and talk like a human being and get some friends to have fun with
The PC Security Channel [TPSC] wear a jacket
I actually thought of this exact question once...thanks a lot for this valuable information mate.
these figures should really be given in SI units I.e m/s or Kelvin
If you are standing still, how are you gonna make it to the shelter?
Yorum tutmuş. Burdan Gökalp Deniz Aral Nadide Melek ve Yağmur kardeşlerime selam gönderiyorum.
the shelter comes to you, obviously
Efe Basey The weather will warm up eventually. I can wait.
In Soviet Russia... etc. etc.
Quantum Tunneling.
Wait for the earth to rotate under you feet
Brb, going to run very fast while naked through the snow, thanks henry
Angelo S if you get your feet wet you will get sick
You forget the ram rise, and it goes up with your Mach squared.
So just run at about 200m/s, you'll get over 20C warmer air, simple.
well i'm from Norway and I do cross cuntry skiing in -20C° in light clothing, and i can tell you that you get hella warmer going fast. with much wind as well top speed is always the warmest. you just need the stamina.
Fun stuff!
There's only one significant factor missing from the calculations (understandably, because it introduces more variables):
Presumably, you'd be moving *towards a warmer place* ...so reducing the time to get there also works in your favor.
Oh my God, thank you! While you may lose more heat running, if you aren't moving you are going to be in the cold indefinitely. Much like the rain calculation, you need to factor in the time you are out in the elements. You presumably won't be walking or running forever, but you would be if you just stood there.
@@sd.2528 Haha, you're welcome!
@@sd.2528 Yeah, travel across a fixed _time interval_ vs. across a _fixed distance_ are fundamentally different problems -- though both can be expressed in similar units (in this case, net heat loss over time).
@@sd.2528the rain could justify the time based calculation as the rain can stop but but the cold can't "stop" so it would make more sense to use the distance based one here
12 mph = 20 km/h
schandfleck ty
19.2 km/h
12 miles per per hour?
D'oh
And 6.4 km/h non-naked
Well done, I can't wait to test this out
This video was beautiful. Thank you for it. The ending was perfect.
When I've run in the cold (
Never had that problem when running even when it has been -30ºC outside. Tho your nose will freeze and dry up.
"Run naked, very, very fast."
This sounds wrong on so many levels.
Flavourius sounds good to me.
Flavourius science doesn't care what you think about it
*right
That's what I say to my girlfriend all the time ^__^
you misspelled arousing
Awesome video guys, and great expaining.
I appreciate idea like these.Please upload new tricks about speed.
One of your best videos so far :)
I like running naked in the snow
. . . won't people look at you ...?
or you don't care
Don't people go hiking or whatnot on mountains? And seeing a naked guy running out in the open is just...wierd
Amazing
Only cabbages and dragons where the guy lives. So many cabbages...
Me too. But only very, very fast.
Are you forgetting time? The faster you run the less time you spend in a cold environment.
He's saying you're far from a shelter, so time is irrelevant here.
So you would die anyways from no food
not necessarily.
Gretchen the middle schooler that can’t spell You'd die quicker from lack of water.
But there is so much ice around you
Sweet calculation. Love it!
She: It's cold today, isn't it?
Me: Wanna run naked?
She: What?!
Me: What?
don't worry bro, you have physics on your side.
You've also got to account for the time it takes you to get to a warm place. Standing still, that time is infinite, so even with much less heat loss, it is still the wrong choice.
Derriving the full answer would be an interesting differential equations problem (that I'm sure has been done) but there are a lot of variables so you have to make some choices in how much to put into a short video.
then we are not taking into consideration that you arrive at the "shelter" faster if you run
When is there ever no wind when it's cold?
I had the same thought. The total net heat loss over the duration of exposure is important. If you wait motionless and naked until the weather warms up here in Wisconsin, you will end up a popsicle. Much better to go home and curl up in front of a cozy fire.
HI Henry! This was a great video. I'm wondering how this applies to bicycling. I bicycle commute everywhere and when its cold I often find that after 1/2 mile, no matter how cold I think it is (granted, its in California) I warm up and forget about being cold. However, that first 1/2 miles is pretty painful! I sometimes bring a jacket, but have to take it off soon or i will sweat and then be hot and forced to leave it on because the sweat will make me even colder! Would love to see some numbers on bicycling. :) Thanks for the great video!
Ahhh that`s where it comes from "Jingle Balls"
actually snow changes all the calculations
drops calculator
r u kIDDING ME?!
Enough snow, you would be better off building a shelter out of it.
when i heard "five minute mile" i was like. is it possible for humans to even run that fast. but then i remembered that you are americans.
i dont get it
an American mile is 1,67 kilometers (roughly), while an European mile is 10 kilometers
So, you're implying that only Americans can run a naked 5 minute mile?
@@benjamined5519 are you dumb both miles are the same, at 1608 meters. Makes for almost perfectly 4 laps of an athletics track.
@@dave.004 Are you dumb? Different places developed different mile lengths. 1609* meters is an imperial mile. The Dutch mile has varied between 3.3 and 6.3 kilometres throughout history, and 1000 since metric was introduced. A Danish mile has varied between 7.5 and 11.1 kilometres. In fact, most European miles throughout history have been between 3 and 10 km.
Very thorough and concise!
Damn, I asked this question to one of my friends too.
Man, you are awesome!!
How about running on the spot?
CHECK AND *MATE*
He mentions at 1:56 that running in place is an alternative way of staying put.
(Pause then read the caption)
wow, that lasted for like a milisecond
why would you use MINUTES/MILE as a unit??
Standard between runners.
that's not even a unit of speed, that's like a unit of refractive index or something
@@1224chrisng It is a unit of speed. It takes a certain amount of time for an object to travel a distance. Min/Mile or Min/km is quite a standard unit to use when talking about running speed.
@@mrWade101 it isn't, Miles per Min would be a Unit of Speed, Min per Mile is like a unit of Distance*Frequency
@@1224chrisng The amount of time it takes for something to travel a distance is a unit of speed. It tells you exactly how fast the object is going.
This was great! Can you do one on what is the best speed to run at to be more or less wet from the rain?
My practical experience: At freezing temperature, I used to go jogging in thin tight leggins, running shoes and t-shirt with short sleeves. The arms were red from the cold, but inside my body was heating. That is an awesome feeling, like swimming in an ice pool after the sauna!
But I stayed near the border of the city and didn't go too much into the Black Forest; for in case of a possible accident I didn't want to freeze to death too fast.
My speed was 5 min/km (= 8 min/mile or 12 km/h or 7.5 miles/h or 3.33 m/s), and I ran about an hour. Then I arrived at work, so I don't know what if I had run longer.
I've always thought about it but the opposite way, when it's really hot and sunny how fast should I walk? Walking faster makes you get out of the sun faster and the wind slightly cools you but the exercise heats your body... Thought I was just off hahaha
That's why it's a good idea to keep track of any shade ;)
In the sunlight, there's a trade-off - running faster means a lot heat for less time while walking slower means some heat for more time - but in the shade, you unambiguously want to walk so that you can spend as much time cooling off as possible ;)
So one thing he doesn't seem to take into account is that this is the heat loss RATE, correct? So yeah, you have to run at 5 min/mil pace to match the heat loss rate of standing still, but you get to your destination faster and therefore *could* lose less heat over all. And if you're standing still, you're continually losing heat and will never reach the shelter and thus just freeze and die. Is my logic incorrect there?
He said far from shelter so time doesn’t matter
Awesome explanation.
I am in Canada in this exact situation and this video helps so much
Much love to you Henry, Ive been a subscriber for over 4 years and you are an inspiration ! Ive started making educational videos too and hope one day to be as awesome as you !
Awesome videos! Do you make them yourself ?
Thank you! And yes i do :)
Now THIS is the science we need, none of that silly 'quantum mechanics'. Naked snow running dynamics.
I thought this was a Domics video when I first clicked, not to say I don't watch your videos because I do :P, but I'm glad I clicked it anyway because I was just wondering this yesterday, so thanks!
Thank you for the great job
Great video but you didn't consider that while moving faster you also get to destination faster so total cold exposure will be shorter and another factor would be the maximum possible heat output - so how much heat can we generate before we run out of the fuel (calories). Thanks for this thinking provoking video anyway! :D
he didn't need to consider that factor, the problem that was set forth was just, moving in the cold, not moving from point a to point b
It did say walk or run in the title though, but then the video was about move or don't
He said far from shelter
Run naked in the snow...*GOT IT* 😏
ive been waiting for this video my entire life
this has to be one of the most simple explanations you given
That voice crack at 1:08
slo~Owly
Dog 😂😢😂😂
Run, you definitely get warmer
Might work in mild temperatures but just try that here in -33C/-27F. Not so good idea
If you are out in -33C you don't have exposed skin and so running is much warmer than not. As anyone who does anything physical in the winter can tell you, it's very easy to work up a sweat in -33C weather, which can be fatal in some circumstances.
Ofc you can have exposed skin out in -33C but it's f*cking cold. Your glasses will freeze and stick up to your skin. The best way to keep your self warm is to put many thin layers of clothes on top of each other instead of just one thick layer. But we were talking about what to do when you don't have those warm clothes and then you should not run because you will need to use more oxygen and that oxygen is gonna freeze your lungs up and you may end up having a pneumonia and that is a serious problem
run in place for best results
The video was literally about if you should run or not during different circumstances. Take a peek.
Henry: I live in the upper midwest where sub zero temps are common. The risk of frostbite changes not insubstantially depending on whether you're running upwind or downwind. I have a normal personal limit of 0F with wind present even with second skin materials layered on. If I only needed to run downwind, I could drop that limit by 5-10F depending on the strength of the wind.
You could also do excersize that keeps you in the same place, like running in place or doing jumping jacks. Even shivering.
I’ll just stay home with my air conditioning.
Dashing through the snow...
On a one horse open slay
LOL man you just made my day ! thank you !
Also depends on temperature. If it is colder than -25 C the heat lost to heating the cold air seems to balance any increased metabolic heating.
Interesting theory. However, this is my point of view, once you start running, you start to sweat making your body wet. When your body's wet it loses heat way faster than when you're dry right? wouldn't this making running ineffective then?
You only sweat if you're producing excess heat. If you're running naked in freezing weather that would probably be never.
kerzhesagt and minute physics in one day
Lol I watch them both as well.
I appreciated all the little annotations in this one
Great Job
How about i just wear my jacket?
Yes, I usually run naked
Just based on my personal experience as a long-time runner in a cold climate, I'd say you want to run. Now admittedly I don't run naked (although I do recall running naked in winter from the house to the sauna on my grandparents farm when I was a kid ;) but I have done some running races in pretty cold weather wearing just shorts and singlet. Once you stop running, you need to find shelter or put on some clothes quick, though, or you will go hypothermic!
Yes! Thank you, I've wondered and now I don't. I run late to the train and start sweating in the winter; so if I have to run i'll delayer a thing or two.
I mean this whole theory assumes constant 0 mph wind which is rarely the case, especially when it's cold, so that makes standing still just as bad as running
Freezing at 0 degrees Celsius? Hahaha! I remember a time when i was jogging at -15 Celsius while wearing a light jacket. I was 17yo back then btw. Anyways, greetings from Russia lol
ofc you're from russia
Same there expect I live in Norway lol
Facts you need to know for your winter run/walk of shame
0:48 - thats basal metabolism there. your discounting shivering and non-shivering thermogenesis, which aren't constant and are stimulated by cold exposure (which fits this situation)
You should do a video on, "can you see darkness." I want to prove my friend wrong
->Darkness=No light=You don't see anything
->Its just that you know when a place is dark because you cannot see anything
->>>BUT the real question is about seeing darkness, to that I say no because darkness is not really
an object, it is a word. its like saying: can you see coldness, or can you see smelliness
"Hey bro, can you see darkness?"
"WTF are you talking bout bro, there's no light you can't see darkness"
"Hey! Vsauce! Michael here! Can you SEE darkness?"
Me: "I am darkness"
I suppose it depends on how you define "see". Since darkness is the absence of light and you are using your sense of sight to determine that there is no light; can that be defined as "seeing that it is dark"? Or is it more accurate to say "not seeing that it is light"? Logically they both mean the same I guess.
It depends on whether you have darkvision or not.
Like that Dio song Rainbow in the Dark
Use proper SI units for fucks sake
or rename the channel to *minute miles* ^^
science 😂😂😂
convert it yourself then
Curious how the calculation would have changed when you factor in the sweat produced by running, which enables faster heat loss... particularly in the scenario "you run for 1/4 (or 1/2 mile) and get tired and walk for 1/4 mile". Also, running in snow greatly lowers the speed at which you would produce sufficient heat to make it worthwhile... and also makes it more difficult to reach your goal, the shelter.
Not quite answering the comment I left at physicsgirl a month ago, but it's in that direction:
"We live in Wisconsin, and I walk the kids to school most mornings. Some cold mornings it is hard to get them moving. This spawned 2 discussions: 1. Could we model the conditions to determine what the optimal walking speed is such that increased internal warmth (especially circulating to the face) overrides the increased relative windchill from increased speed (which is noticeable)
2. If we walk a mile, what speed expends least energy considering propulsion and body heat regulation given the varied duration"
What did the librarian say to the UA-camr?
Read more
Arnaldonintendo LOL
Arghhhhhh I tried to click it....... You .........
Nice one
I see what you did
Not sure if I'm the only one, but I had to click "Read more" to actually see your "Read more". I know this because there's a "Show less" right below your "Read more" now. And, you know, because of my cursor changing to the hand, and the colors of the "Read more"s.
Winter is gone, make video for fucking summer
Faheem Ahmadkhan you do know that once winter is over snow doesn't just fucking disappear. Most of the northern US and all of Canada is still cold as balls.
Winter is actually starting in US.
It also depends on the temperature, moisture and wind. And in practicality, it also depends on how far you need to travel to get out of the cold. But interesting thought anyway.
thank you dear.
mph... sorry i only speak SI.
then don't watch
James Caldwell sorry, guess the rest of the world should stick to science independently, leaving America in complete isolation :P
0:54 Calories or KILOcalories?
Now we know.
Thanks!
Awesome video :-)
if this is a science channel don't use or say miles,use kilometers like everyone else does.
That's because the USA is a developing country (like Liberia and Myanmar)
i.imgur.com/tWWXoT3.png
Developing? More like regressing.
damn, you guys are dense
I'm happy I live in New Zealand.
(oh wait)
+science By "developing country," I'm assuming you mean it as a bad thing.
You didn't take into account that the running person would be sweating.
David Samolkin Not in cold conditions you won't. Only when producing excess heat you will.
1:56
That subtitle, run in place... this is why we shiver. That's exactly what it's for.
OMG Love this channel. You guys are better then Asap Science Can you Do a video on the quantum theory please
Isn't this just like the "Should you walk or run in the rain?" Video?
J. H. Not really. It's an entirely different set of considerations.
ya it seems to ne
then watch the video.
Only if your body generates dryness by running faster
Nicholas Wright your body generates dryness now? Plz say that was sarcasm
can any one convert 15m/mile into non-retarded units?
www.wolframalpha.com/input/?i=15min%2Fmile+in+km%2Fh
about 6.5 km/h
Thank you, good sir! 6.5 is not that fast.
google.com can
It was a 5 minute mile (aka 12 mph), not 15. It isn't retarded, it is just targeted to runners. Anyone who has timed a run should know their mile time (assuming you live in America like the makers of this video, and if you don't live in America, stop crying just because you are unable convert things), so this gives them an easy comparison.
So for your (largely useless outside of calculations) units, it would be 19.3 km/h.
Hey! 24 on trending! Great job minutephysics!
when you go for a jog (around 6min/km or 10km/h) you are told to dress as if you where going for a walk when it is 10K warmer. And trust me, you will be getting quite warm if you run with a Shirt and some shorts at temperatures around 12°C. So you may lose more energy than when you would be standing still, but you also generate enough heat to not freeze anymore. Experienced runners run in short running wear (Shirt, shorts and runing shoes) at temperatures way below 12°C, even at temperatures below the freezing point. and though they may be faster than 10km/h many will not run the here calculated 19.2km/h for very long. So you probably have a little error in your heat generation, most possibly, because it also is affected by the pace of the runner.
This is the same as the walk/run in the rain argument again. The answer is; Get out of the damn cold!
Joey Wolf no. you obviously didnt watch/undetstand the video.
yeah but then the question is how fast should you run from everything that's trying to kill you or eat your babies.
Not at all... But who knows, maybe someone wondered about this based on that video... ;)
Love this
TAT=SAT*(1+0,2*Mach^2) let's say we are in a location at Sea level on a cold winter day with freezing temperature of 0 celcius degrees, so SAT=0. If SAT=0 then local speed of sound = 1192kph. If we wanna warm ourselves up to 10C, using the formula with temperatures in Kelvin, 283=273*(1+0,2*Mach^2), so required Mach number is 0.447.We calculated Local speed of sound as 1192kph so 44.7% of it would give us a speed of 532kph. So we need to run at 532kph to warm our body surface up to 10C through kinetic and adiabatic heating.
I'd say walk. Greater wind will lower your body temperature faster.
That's why there is wind chill - it only matters for warm bodies.
It can be 10F outside with 60 mile winds, and the temperature will never drop below 10F on anything. But for a body that needs to stay warm, it will be as if you are in a MUCH colder environment.
Oh - we were also talking about generating body heat while moving - well, that's different.
i didn't knew i needed this
this is it. this is the video that made me sub
Very nice couple video to the "run in the rain" one. Congratulations.
I think statement in 1:41 "it´s just the point when you lost less heat running than standing still" may be not correct. Shouldn´t that say: "it´s just the point when you get
a higher body temp running than standing still".
The reason is that heat loss must be higher running in any case, from the fact that heat production is proportional to speed.
With adequate clothes you probably lose most heat by exhaling. And you lose more when running, but how much exactly depends on your personal physiology. In any realistic scenario where the question even makes sense exhaustion and confusion is probably more of a problem, so keep calm and walk at moderate pace that you would be able to keep for a long time. The key is to make *really* sure you are walking in correct direction.
P.S. Hello from still-snowy (darn it!) Russia.