Liquid Nitrogen?

Question

How long would liquid nitrogen stay cold in a un-insulated sealed metal container,say @100 degrees F.

Answer 1

Nitrogen's boiling point under 1 atm of pressure is about -196 degrees C.
If one had a container (no matter the material), liquid Nitrogen will never rise above this temperature.

As the liquid Nitrogen absorbs heat from the surroundings, the temperature rises to its boiling point and then the temperature remains constant as the Nitrogen boils away. Once a substance starts to boil, the temperature stays constant as all the energy put in goes into over coming the latent heat of vaporization as the liquid boils.
In other words, the liquid Nitrogen would stay "cold" for the duration of its time spent as a liquid. Once the liquid Nitrogen boils into Nitrogen gas, its temperature can then begin to rise again.

If one wanted to figure out how long liquid Nitrogen will stay a liquid will depend entirely on the rate at which heat energy is absorbed (which in turn depends on the size/shape/material, ... of the Container) as well as the initial amount of liquid Nitrogen.

Answer 2

It would need to be a material that either does not become brittle or remains sufficiently strong at extremely low temperatures. I suspect that certain metals like tungsten or titanium would not actually shatter if hit hard after being dipped in liquid nitrogen, although their material properties would change significantly at the low temperature.

Answer 3

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Answer 4

In my opinion, liquid nitrogen is not cold @ 100 degrees F. Would you like to restate your question?

Is the container or the liquid nitrogen @ 100 degrees F?

Answer 5

I'm guessing that the metal container will transfer heat into the liquid nitrogen, causing it to turn to gas. If the metal container is not strong enough, I would expect it to explode from the increased pressure.
I would expect this to happen rather quickly. If this happens, of course, the liquid nitrogen would very quickly warm up and turn to gas.

Another things that might happen is: if the humidity is high, a layer of ice may quickly form on the metal container. The ice would insulate the nitrogen container. I think the same thing would happen as in the first case, but more slowly.

But, who knows? Try it and let us know what happens.

Answer 6

Till it converts into its gaseous form. The cooling effect of liquid nitrogen is due to expansion in volume from liquid form to gaseous form. The sealed container at 100 degree F does not bother.

Answer 7

first of all, if you do not use a cylinder like those that are used by gas companies, you will have explosion, Liquid nitrogen evaporates - turns to gas - instantaneously at room temperatures, so.... gas has such a high volume relative to liquid.

Answer 8

it depends entirely on the size and shape of the container

heat transfer is a surface phenomena

if you had a narrow cylinder, with lots of surface area per volume, the heat from the 100 deg ambient conditions would transfer very quickly

if you had a giant sphere (which has a low surface to volume) then it would take a longer time for ambient heat to transfer to and heat up the nitrogen

of course, the pressure would rise quickly in a sealed metal container of liquid hydrogen as it warmed so it better be a real strong container

Answer 9

it will stay in liq. form for 1/1000 of second 'cos liq. nitrogen is highly unstable

Answer 10

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