Neil deGrasse Tyson Explains the Difference Between Mass, Weight, and Density
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- Опубліковано 9 лип 2024
- If you’re trying to get in shape you need to lose weight, right? Neil deGrasse Tyson says wrong. On this StarTalk explainer, Neil and comic co-host Chuck Nice are breaking down the differences between mass, weight, and density.
To start, Neil tells us why when you want to get in shape, you need to lose mass. You’ll learn why a weight-loss book written by a physicist would just be one sentence. We explore the difference between mass and weight and why weight is all about forces.
Then, we move on to density. Find out why heavy cream is lighter than skim milk. We explore how the hull of a ship keeps the ship buoyant. All that, plus, Neil explains why, if you want to lose weight quickly, just head to the Moon and hop on a scale.
About the prints that flank Neil in this video:
"Black Swan” & "White Swan" limited edition serigraph prints by Coast Salish artist Jane Kwatleematt Marston. For more information about this artist and her work, visit Inuit Gallery of Vancouver inuit.com/.
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Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!
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0:00 - Introduction
1:07 - How To Lose Weight
1:38 - Mass
3:57 - Weight
5:01 - Density
7:47 - Neil’s Coffeeshop Dispute
9:02 - How To Float
11:15 - Units of Mass, Weight and Density
13:41 - Why Fat Floats
14:24 - Why Ice Floats
14:53 - Closing Notes - Наука та технологія
![What is Density? How to Calculate Density? - [1-1-5]](http://i.ytimg.com/vi/cSsrB_Nb0vM/mqdefault.jpg)
One on momentum, angular momentum, torque etc would also be nice.
*Nerd*
Inertia, momentum, kinetic energy. And with angular momentum in both a stationary hub reference and with a moving hub(like rolling down the road)
Motorcycle physics boi
YES WE DEFINITELY NEED IT HIGHSCHOOL PHYSICS
@@adamflynn7322 All of Newtonian physics.
At this point, Chuck is getting a free PhD just by being around Neil 😂
True lol
I think we all getting a little addicted
The way some people got honorary titles, Chuck certainly deserves at least one of those.
PhD isn't about acquiring old knowledge but creating new.
To be fair, Chuck is an intelligent man in his own right. What he may lack in formal education, he makes up for with a quick wit and an inquisitive mind. He always manages to come up with really smart questions. (I defined a smart question as one that doesn't have a simple answer, a question that can lead to an entire discussion.)
"YOU JUST GOT SCIENCED"
Neil Degrasse Tyson, 21st century, 2020 (human calendar) , Milky way, Planet Earth.
You forgot to mention the Timeline!
It will show up on Google searches soon
Sol System, Earth
Humans have more than 1 calendar
12020, kurzgesagt calendar. My favorite so far.
Mass is an amount of stuff.
Weight is the amount of force exerted by stuff under gravity.
Density is the amount of stuff in a given amount of space.
A bunch of feathers is a mass that weighs 5kg and takes up a huge amount of space because it isn't dense.
A barbell is a mass that weighs 5kg and takes up a small amount of space because it's pretty dense.
"Mass" is hard to quantify without gravity. If you have a six-sided die (d6) made out of _papier maché_ and another one made out of iridium, one will be much heavier, because it's much denser, meaning it has more mass in the same volume as the other one. A box of tissues and a gold brick have about the same volume, but you can pick up the tissues with your bare hands. With no gravity, you can pick up both, but the gold bar will still have more mass, and it will still have the same density.
You can file that under Things Flat Earthers Refuse To Understand.
Expertly explained, thank you sir
Weight is a resistance to acceleration. When the bus starts it accelerates forward and your weight goes backward...weight is not only from gravity, weight is only from acceleration.
@@davidmudry5622 I was trying to come up with an explanation simple enough for even flat Earthers to understand, not that they believe gravity is real, so I went for less accuracy and more simplicity. But thank you for making up the difference with a better definition that explains why the gold bar would still be hard to move in zero gravity.
@@EdwardHowton Neil deGrasse Tyson teaches the Newtonian Free Body diagram where an arrow pointing down is gravity pushing down, and an arrow pointing up is the Normal force pushing up. Standing on a scale they say these two forces are EQUAL and opposite therefore you are not accelerating. But wouldn't the two forces cancel each other out if they're equal and opposite, and wouldn't you be weightless while standing on a scale? I don't like Newtonian physics. However, Einstein does agree in that if you are not being accelerated then you are weightless, but that happens when you are in free fall. ua-cam.com/video/XRr1kaXKBsU/v-deo.html
@@davidmudry5622 Didn't take you long to go from zero to nutjob, huh. Veritasium still sucking up to a manbaby billionaire grifter these days?
This is why we can't have nice things.
I wish my Science teacher taught me like this, I wouldn't have taken Commerce and Accounts.
I sooo identify with this
That must have been a real interesting account class haha
But accounting involves a lot of math right ? It's still interesting.
I didn’t grasp what they were until I graduated high school tbh. Density was the hardest but I understand it now.
I so get it! I was fascinated with science when I was a kid. But. . . oh wow. . . I had bad science teachers. . . except one. In fact, to this day, I still don't grasp the whole mass, weight, density, volume thing. I'll have to watch this a few times.
Imagine entering a coffee shop and seeing Neil Degrasse Tyson outsmarting the waiter who lied to him haha. Tremendous.
Plot Twist: The waiter put the whipped cream in first and it got diluted when he poured the coffee...
Just randomly about the ivory soap floating being a feature. It was likely a selling point when showers weren't a thing and you only had people taking baths. So if you let go of the soap you'd rather have it float and be easy to find than try and find a slippery thing at the bottom of some murky water.
Plus, air is free
... Probably weren't benefitting much from the soap anyways if your bathwater is murky...
I heard it was a selling point in the 19th century when a lot of people bathed in creeks or lakes. If the soap sank you were out of luck.
The selling point was a lighter soap with less soap and tiny air bubbles Ja Ja
@@jasonlueker3032 What are you talking about? Solid bars of ivory soap float just fine.
Gotta say that these videos are more important to me during this time than you could ever know. Thank you for doing you!
This episode was very interesting. I knew these things, but was never able to explain it to others. Thanks for the lessons! I love you guys.
Here in Ireland (in the UK too, I think), what you call "heavy cream" in the US is called "double cream". We have "single cream", "whipping cream", and "double cream", which all have differing amounts of fat.
I gather the milk in Ireland is pasteurized and blended
@@rd264pasteurised and homogenised, yes. Why?
It's 4:20 and time for another Xplainer VIdeo! Never miss an episode. Thank you Chuck for all your hard work at making me Feel More Intelligent than I normally do.
With this episode you have me excited for some cool future explainers!!!
I have been told that the soap floating was a selling point because at the time people still took baths in lakes and if you dropped your soap it was very difficult to find, whereas if it floats you can see it float and get it very easily
Idk how true that is but I remember being taught that
That was the marketing push. Really they just were adding some air.
@@mytech6779 Well, if that's the reason why the customers preferred Ivory soap, then the demand was real and not simply a marketing ploy to reduce costs. Or are you saying there was no actual demand for a floating soap? Did I misunderstand your reply? If so, sorry.
These explainer videos are very useful. Dont stop making them. Thanks
Thanks for the mention fella's. We lumberjacks certainly appreciate the enormous physics/dynamics we unleash during production of our wood cylinders. Big fan!
- Paul Bunyan Guy
I think Chuck gets an additional bonus in any gravitational situation because his humor is so uplifting. :-)
Love Star talk chat,thank you for sharing Gentlemen.
Love this explanation, might have a few words in it ;-) that I might hesitate sharing with my 4th graders, but..... love the explanation! Neil is the only one who can explain about astronomy to this elementary science teacher and have her understand!
Love these explained videos
That’s my favorite ndt story. That was an excellent explanation of the scientific process
Keep posting interesting contents like this!
This explains why, despite its size, Saturn’s gravity is comparable to Earth: an object’s mass determines the strength of its gravity. Saturn has a low mass because its density is *less* than that of water. If an ocean large enough to contain the totality of Saturn existed, Saturn would float on its surface.
I’m familiar with that BUT, I’ve been thinking... If there was an ocean that big it would have to be on an incredibly huge planet, with a density greater than water, which would make Saturn weigh a LOT more...
I think Saturn would just “spill out” all over that planet like a gargantuan oil spill!
I am thinking it would collapse under its own weight instead of maintaining itself as a sphere..
Maybe Saturn would merge with the planet and form one MEGA HUGE planet.
Maybe even a star!!
@@anthonyhamilton7778 Yes, and the denser core of Saturn would sink down into the ocean rather than Saturn holding together in one piece.
@@anthonyhamilton7778 so I’m guessing it would make a brown star
No, just no, F. go back and watch the video again.
Sooo great!
I am enjoying this so much!
Thanks thanks thanks
thank you! this is helpful!
Wow my eyes are open now I have been using these words for years and not really known the meaning thanks Dr Tyson
The only explainer video where these guys talk about the topics of future explainer videos. They better make those videos soon
I love StarTalk!
Would love to see a explainer on ice expanding. Very interesting/ convenient that it's one of the few materials that expand while getting colder. Please let me know your knowledge about this.
PS: awesome show/channel, keep it up!👍🏼👌🏽🥳
Thats really really awesome video..it actually blowed my mind twice.
They're still at it ✨
Mug u give cvg u I is m
Always
A little sanity in a crazy world
@@michaelcomisse9478 True, but what about Chuck? 😏
@@ZeniferJenZ hahaha I guess the difference is hes aware of his insanity and is doing it for a laugh. He's become surprisingly science literate though. I guess thats what happens when you hang out with Neil all the time
Chuck makes these episodes great
Superbly explained... very animating ❤️
chuck is one of the reason i watch startalk
This is one of my favorite stories every. Heard Neil talk about this in another youtube video(s)....and I was just taken aback and shocked. Employees at restaurants just get rushing to make your food.
That's best edutainment channel !
there is very easy to understand way explaining this floating problem, in order for an object to float, it's weight must be less than the water it displaces. Great fan, love you guys!
We need you to keep talking about this mr. Tyson all your advice and your teacher skills we need it to keep going on and on and more more more more more more more from you lot of people need this mr. Tyson
We need some startalk merch! @StarTalk ! When are we getting new startalk merch guys? :)
Neil and Chuck! When I was in grade 9, I my science teacher stated that as gas compressed to liquid and then solid, it's volume diminished...but ice-water was an exception. I asked why it behaved differently and she simply answered: I don't know. It's been bothering me ever since, and I'm now 36 years old. Please please please don't forget to answer this question in either an explainer video or a cosmos queries. Thank you!
Chuck is the best!
Neil, you're just wonderful! Can't wait to hear about the ice expanding! Be safe. Be well! .....Canada
I love the epiphany moment Chuck has about ice expanding at the end :)
Excellent
Just wanted to say I love star talk. I miss Carl Sagan ( hope I spelled his name correctly ) . But want to also say that it's nice to see someone who does a great job in his absence. Keep looking to the stars and thank you so much.
Always good!!! 🙂🙂🙂
Yes star talk
You two are the best.
best youtube channel.
You both are amazing..
Dear Neil,
I don't know if you will even read this but I am desperate hence I choose to comment here and try my luck.
I wish to understand mathematics in it's true form. Ever since school we have been told to accept formulae and move on with it. I never really understood what is happening at the most basic level of any topic. I love the way you explain these concepts. I was hoping you could direct me to a source which can teach me all the concepts right from school level to university level in a way which helps me understand concepts at deeper level.
Thank you in advance!
Do an episode on buoyancy alone and the misconceptions. Would be awesome
Sat my 9yo down for this one, and she understood every bit of it. Pretty neat to see
Please do the ice expanding explainer!
So great! I am also looking for „Ice expanding“
very😊 nice learning
I have touted my 2 step weight loss plan for decades when talking about dieting. 1. Reduce caloric input. 2. Increase caloric output. Simple as that. You don't need a keto diet, Atkins, weight watchers, Jenny Craig, Nutrisystem, etc.
Thanks for helping me with my physics class
Do an ICE explainer please! Your explanation on JRE about water/ice was amazing 😁
Chuck makes these interactions great! Love you both!
At what point in a blackhole wounld you be a negative weight? Would you still have the same mass?
Love it! Always a great show. This is much better than watching any politics learning something new.
That whipped cream story is what i was waiting for. I had heard it from him long ago and after they started talking about heavy cream... i knew he was gonna bring up that story.
This is so interesting 🤔 🥰🤗
I can watch these two all day
Have a question: difference between neutron star, pulsars and quasars?
Well, a neutron star is small compared to other stars and it's also very dense. A pulsar is a rapidly rotating neutron star that emits radio waves and other stuff. Quasars are huge active black holes that emit lots of energy. This makes quasars very luminous!
easily found with a simple search online.
@@mavfan1 Yeah. I don't know why people ask a question that can easily have a solution found on the net.
@@evocatus. Formulating and writing down a question enhances learning. Social interaction probably also helps, in many cases. There can also be other dimensions to asking a question; other reasons why it might be meaningful to you. Furthermore, the discussion that might follow, might give new insights.
You forgot the coolest thing in the universe "BLAZAR"
I was going to show this to my class until the swearing started. Thanks a lot Chuck. It's hard enough to share brilliance with kids without the useless expletives.
Neil and Chuck should do experiments in StarTalk Explainers👍👍
Humour helps comprehending heavy stuff
Would love a rant on the various right-hand and left hand rules in physics...
They are the best that's it!.
NOOO!!!
MORE Chuck tomorrow 🥺💕
@StarTalk, if it’s winter on the Northern Hemisphere and summer in the Southern Hemisphere, what season is it at the equator?
Can we get video explaining displacement please
Neal explain the Eötvös effect. I think it is a interesting topic to talk about.
I got another story to impress my Girl. ♡ Thanks Science!
Yes please, I want an Ice expanding video !!!!
LOVE these weekly 'splainers! Thanks, gents.
Hm, I've always been a "sinker" in the water....my wife's right about me being dense!!
Do an explainer on precision vs accuracy in physics.
Yeah Neil, please explain the little sun on the aquator thing. It's hot there because the sun rays directly hit it... or so i thought. We await for you to... (*voices in the distances shouting "don't you dare say it"*) enlighten us.
I am gonna guess they get more clouds or something thus less direct sun on the ground. I dont know how accurate that guess is.
It depends what you actually mean by 'little sun'. Neil probably meant daytime.
Remember that the Earth's axis is tilted. That's why we have the tropics of Cancer and Capricorn.
it's less mass of atmosphere that sunlight penetrates and deposits heat into, when it shines straight down onto the equator. But the atmospheric currents and other effects distribute the heat. Weather is a consequence of energy trying to disperse evenly.
@@Purrfect_Werecat Yeah, prolly more water evaporation at the equator, meaning more clouds and rain in the "rainforests" resulting in less sunny, cloudless skies per year.
Quite the contrary: we love Chuck!!!
Man, I love this
Ice expanding! We need that❄️👍👍👍😂
I love chuck!!
Never knew I needed a soap that floats... now I want it
My happy place ❤️
"So, if Chuck weighs the same as a duck..."
"He's made of wood."
"And therefore...?"
I was quite disappointed when he missed that opportunity.
A witch!
And therefore... He's a Wack? 😳
Are you making fun out of me
@@duck3468 Yes, we are, what are you going to do about it?
Please explain the physics of swimming sometime prof Neil.
I saw Chuck on the TV and immediate start looking for Neil. Then I realized it was a commercial. Can't remember what the product was,, but it was funny I wanted to see them both together.
@StarTalk I have a question,
The faster you travel, the slower the time (compared to one moving slower), how big is the difference between for example Sweden and the equator under one year??
Really love NDT! Learn something new every day and enjoy learning it and left wanting to learn more. Have to have my daily fix of education now. Truly is an educator. Takes the “boring lecture” out of science. Oh and Chuck is ok too I suppose 😂😜
love you guys you always make my day. I'm 14 years old and would love to grow up to be like you(an astrophysicist) or a theoretical physicist.
Astrophysicist is the profession.
@@romanlee8287 thanks
For those in the know, calculating physics in the foot/slug/second unit system is identical to using the meter/kg/second system
accelerating one slug one ft/S^2 requires one pound of force. 1 1 1 1
accelerating one kg one meter/S^2 requires one newton of force. 1 1 1 1
This is why they are called unit systems, unit means 1.
Just the same, every equation in my aerodynamics texts can use either system with no changes or added steps.
So... When standing over a weighing machine and tells me the read in kg is it my actual mass or is it my weight in Newtons but with Kg on the right?
You step on a weighing scale on the earth. You find that it reads 70 kgs. This means that your mass is 70 kilos. Note: Weighing scales actually measure kgf (kilogram-force) which means they typically measure your weight (the force acting on you) then divide it by 9.81 (which is the acceleration due to gravity on Earth) which results in your mass.
So what is your weight? We can use newtons second law to arrive at this answer ; F = ma ; m = mass = 70 kilos. a = accelaration of gravity on Earth = 9.81 m/s^2
Therefore your weight would be 70*9.81 = 686.7 Newtons.
on moon you would weigh about 1/6 of that on earth. but your mass would be the same
Yes.
the explainer about the equator sounds interesting
has he done one?
very well😊😊😊😊
I wished that i could serve you whipcream!! And you talk about physics and stuf😍 and i just going to sit there and listning!!
I see thank you
Gosh dang, I think I finally get the difference weight vs mass.
I really wanna know what's NDT's take on formation of our Moon 🙏🙏
Neil you guys should do a precision vs accuracy explainer.