Here's a Question! - Which Melts First?
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- Опубліковано 15 січ 2023
- Two, essentially identical ice cubes, are placed in liquid nitrogen. One ice cube is left in the liquid nitrogen for one hour. The other ice cube is left in the liquid nitrogen for five hours. Both ice cubes are removed from the liquid nitrogen and are allowed to melt under essentially identical conditions. Which ice cube melts first?
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#liquidnitrogen #icecube #heresaquestion
Ah Ha! If you had $10 two years ago, in your pocket you would now have $2
No wonder my bank account is having a downfall
Busted
@David Jameson Depends on where you live.
Whenever I answer correctly, I overthink and change it.
Thank you guys, I hope these questions won't be stopping, I love these!
You two always have interesting things to think about and your demonstrations are great. Great opportunity to learn about physics. Thank you for your videos!
Thank you for watching!
Looking forward to "Does hot water really freeze faster than cold?", the “Mpemba effect”
Hi, I always love your content. Thank you for your work. You might want to consider changing your thumbnails (example: surprised face pointing at ice, bold letters: Which melts first? ) I am subscribed but I had forgotten to enable the all notifications and UA-cam didn't even show your videos in my subscription feed :( . Hopefully, by adjusting to the algorithm just a bit, more people will find and enjoy your great work!
Neat to see the water vapor refreeze on the styrofoam
I am a great fan of your videos and want to see more views on it because you teach about very interesting topic of science. So what I want to suggest you is that make some improvement on you thumbnail, you can add some photos , make it in a way that people will see it at its first glance ., lastly I love your video and the way you teach . LOVE FROM NEPAL❤❤
Why is this channel so underrated?
I was not sure, didn't know, for sure, if one hour was long enough. I did understand the idea.
I thought that maybe the one in for five hours would have some kind of change, if liquid nitrogen has any form of slow reaction with frozen h2o. (High school science was ages ago!!) But now I know it's safe to leave ice cubes in for a few more hours 🤣🤣
SHC of both ice would be same, so was the the temp inside liq N2.
The ice would have freezed in N2 and would have reached equilibrium with N2 kept in 1 hour as well as 5.
So they are basically same ice cubes
However, had the ice cube not achieved equilibrium in the liquid nitrogen within that first hour the 5 hour ice cube may have melted faster or slower depending on the surface tension achieved.
Some forms of ice/water do exhibit quite different properties. So this demonstration in reality doesn’t provide enough initial information to properly allow a full understanding of the question.
I got the answer, and I knew why. However, it was basically a guess. I just assumed an hour was enough time, but I didn't know it was for sure.
"one hour is enough to reach thermal equilibrium" - really - how would someone know this - I didn't assume this
One wouldn't. At least, not without knowing a lot more detail about the ice cube. We though that one hour sounded long enough that most people would assume that it was in equilibrium. You're right not to assume it, though.
For what it's worth, with these ice cubes, you no longer see 'excessive boiling' of the nitrogen after about 15 minutes.
I was thinking that there might've been some water from the air that condensed and stuck to the ice cube, oh well
There was. Both ice cubes are covered in frost for a time. Easiest to see around 1:17. You can see that both ice cubes have some texture to them.
Quality
I'd love to see this repeated but at 1 and 5 minutes instead of hours.
The ice cube which left for 1 hour will melt faster
I saw the left one melt first, essentially, noting how they finished off at the same rate. I have ideas as to why, but i am going ti watch again to see of i was wrong. If so, this comment won't exist!
Yey I got it right
Yay!