Liquid Nitrogen Demonstration

Aaron Keller, Chemistry teacher, demonstrates the amazing properties of liquid nitrogen. He explains each demonstration in an understandable way. The temperature of liquid nitrogen is -196C (-321F). He explains how a dewar flask works. He pulls balloons out of a cooler, showing the expansion of a gas as it warms. He demonstrates the explosive power of the expansion of liquid nitrogen in an enclosed container. Liquid nitrogen is so cold that the floor is like a hot griddle. Liquid nitrogen has a very low viscosity. He demonstrates how brittle a flower becomes when frozen in a liquid nitrogen bath. Finally, he shows how to shatter a racquetball. As a bonus he shows how nitrogen gas can be used to put out a candle flame.

Category:

Education

Tags:

• physical
• science
• chemistry
• liquid
• nitrogen
• cryo
• cryofluid
• cryogenics
• racquetball

[miltos932]

V/T=c iff pressure is constant.

[aaronakeller]

@miltos932 Pressure IS constant under atmospheric conditions.

[DomR1997]

I thought you could touch for like 2-3 seconds due to liedenfrost effect. The heat of you hand causes a gas to form "levitating" the drops of liquid nitrogen.

[aaronakeller]

@DomR1997 See my comments below about the Leidenfrost effect. Also, see my video response to this video which demonstrates it for water on a hot-plate and for liquid nitrogen.

[yippy010]

@adidastwist69  you can get frost bite from touching it and that usually results in the frost bitten part of your body falling off.

[aaronakeller]

@yippy010 Not necessarily. Scroll down through my comments and take a look at my Leidenfrost Effect video for further discussion.

[aaronakeller]

@TheAdmiralPancake That was stunningly unkind of you. Were you born knowing everything? Patience is required when teaching students and showing them something completely outside of their experience. I hope you are kinder in person than you are in semi-anonymous postings on YouTube.

[aaronakeller]

@Nuan3677 No. Boiling liquids do not necessarily need to be 'hot'. The floor in this case is hot, in a relative sense, compared to the temperature of the liquid nitrogen. In an absolute sense, the floor is not hot. At least, it's not hot in a way that you or I would normally define it. After having the liquid nitrogen on it, the floor gets colder.

[Anight7mareX]

You're a great teacher.

[superchee2e]

I love school. They say it's not a toy and then show you a bunch of fun stuff you can do with the thing that's dangerous.

[morganfreemanismydad]

lol, 'can i have half'?

[xundeadpkerx]

This is WHITCH CRAFT

[pipapoist]

Why have my chemistry lessons always been boring...

[protectoroffaith]

@yippy010 leidenfrost effect is what happens when you drop water onto a screaming hot stove and it moves around theres a layer of steam protecting the water from boiling instantly