if liguid nitrogen is a liquid why doesn't it freeze?

Answer 1

liquid nitrogen is a liquid because it is so cold. As soon as it is exposed to room temperature air it starts boiling. You would have to get nitrogen very very cold to freeze it, hold on I'll get the numbers.

At atmospheric pressure molecular nitrogen condenses (liquifies) at 77 K (−195.8 °C) and freezes at 63 K (−210.0 °C) into the beta hexagonal close-packed crystal allotropic form. Below 35.4 K (−237.6 °C) nitrogen assumes the alpha cubic crystal allotropic form. Liquid nitrogen, a fluid resembling water, but with 80.8% of the density, is a common cryogen.

There, thank wikipedia for that.

Answer 2

For a liquid to solidify, you need colder temperatures, or added pressure.

All liquids have different freezing temps, and it just happens that nitrogen needs a really, really cold temperature to become solid, or an enormously strong pressure for it to solidify, too.

I think Neptune, or some planet like that has nitrogen clouds, therefore probably seas of liquid nitrogen, and probably solid nitrogen ice, as well - where is isn't much above absolute zero. Maybe it was methane, I forget.
I haven't the desire to look up freezing temps of nitrogen, it's on alot of websites devoted to physics and chemistry.

Answer 3

Solid Nitrogen Temperature

Answer 4

It actually does freeze, but at an extremely cold temperature (about -210C) that is very costly to maintain, and the uses of frozen nitrogen are limited, which is why you don't see it very often. Based on phase diagram theory, you could also freeze nitrogen at a higher temperature by increasing the atmospheric pressure, but again this is cost-prohibitive...the pressure would need to be about 20 times above normal atmospheric pressure to freeze nitrogen at the same temperature it turns liquid in normal pressure.

Answer 5

I'm no chemist but I will take a shot at this.

There are three states; solid, liquid and gas (plasma is just a hotter gas). Different chemicals change states at different temperatures. It has to be pretty cold to change chemicals like nitrogen from a gas to a liquid. It would take even colder a temperature to change it to a solid.
When I was stationed on an aircraft carrier we had liquid oxygen (LOX) for the jet pilots. That stuff was so cold those who handled it had lace-less boots that could be kicked off if LOX spilled on them. Otherwise the feet would freeze and shatter before they could say "brr."

Answer 6

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RE:
if liguid nitrogen is a liquid why doesn't it freeze?

Answer 7

Liquid Nitrogen is a freezing chemical element that has a freezing point of -346 degrees fahrenheit, and is a supercooled liquid that is extremely cold, -320 degrees fahrenheit. In cryogenics, this is used to take off warts by the process of freezing. These are rapid cooling elements that can cause frostbite, aerosol burns, or put you in a state of numbness or shock; hypothermia. However, liquid nitrogen can reach its freezing point and solidify into LN2 or ice. Cool!

Answer 8

Liquid Nitrogen is a liquid because it is called "liquid" nitrogen. If you cooled liquid nitrogen down further to its freeze point it would become solid nitrogen and a solid.

Look at the water analog. There are 3 states of matter, gas, liquid, and solid. If you start with water vapor at 1 atmosphere pressure (let's say at 110 deg C) and cool it to 99 deg C, it condenses to liquid. If you hold the temperature at 99 deg C at 1 atmosphere, it remains liquid and does not become a sold. To solidify you have to cool it to its freeze point.

Answer 9

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Hmmm, you sure you want freezing point? Liquid nitrogen can be turned into a solid in a vacuum chamber. The freezing point is 63 degrees Kelvin or -210 degrees Celcius. It boils at 77 K or -196 C which is more likely what you are looking for.

Answer 10

It does. Nitrogen freezes at 63 K at a pressure of 1 atmosphere. That's -210 °C or -346 °F.