What happens when liquid nitrogen is kept at a constant temperature of around 60 degree Centigrade ?

Question

1 ) I want to know weather it looses temp ? if yes how much time do it take to loose at least ( 5degree) .
2 ) Does nitrogen (liquid) looses its coldness through time ?

Answer 1

Liquid nitrogen boils at -192 C under 1 atmosphere pressure.

To have liquid nitrogen at 60 C, it has to be in under substantial pressure. I have not done the calculation but I suspect we are talking of 20 - 50 atmospheres so the walls of the pressure vessel need be very thick and very strong - and again I have not done the calculation for the container either.

With the container and the liquid nitrogen inside it under high pressure inside a 60 degree C chamber all the contents remain at 60 degrees C. You need to maintain the chamber temperature at 60 C. Because room temperature is 20 C, your chamber would be insulated and heat needs to be added to off set the heat loss from the chamber to the room. This is because the chamber is hotter than the room and there are heat losses through insulation regardless of whether the chamber had something in it or the chamber was empty.

If you do not heat the chamber, it will ultimately cool to room temperature. The rate of cooling is dependant upon the insulation quality (or the heat loss through the insulation). The better the insulation quality, the longer it will take to drop in temperature but we cannot predict this without more info about the chamber, the insulation, and the room temperature. Contents inside the chamber have little effect on the rate of loss (if the pressure vessel had the liquid nitrogen in it or if it was empty has little effect in this case)

Liquid Nitrogen under this high pressure is at the surrounding temperature. It is not cold and cannot loose coldness.

Now if you were to reduce pressure, which is not what you asked, some nitrogen would convert to the gas state and this cools the vessel (latent heat of vaporization is why).

I suggest you review heat capacities and latent heats of fusion, sublimation and vaporization to learn more.

Answer 2

Liquid nitrogen boils at -192 C under 1 atmosphere pressure.

To have liquid nitrogen at 60 C, it has to be in under substantial pressure. I have not done the calculation but I suspect we are talking of 20 - 50 atmospheres so the walls of the pressure vessel need be very thick and very strong - and again I have not done the calculation for the container either.

With the container and the liquid nitrogen inside it under high pressure inside a 60 degree C chamber all the contents remain at 60 degrees C. You need to maintain the chamber temperature at 60 C. Because room temperature is 20 C, your chamber would be insulated and heat needs to be added to off set the heat loss from the chamber to the room. This is because the chamber is hotter than the room and there are heat losses through insulation regardless of whether the chamber had something in it or the chamber was empty.

If you do not heat the chamber, it will ultimately cool to room temperature. The rate of cooling is dependant upon the insulation quality (or the heat loss through the insulation). The better the insulation quality, the longer it will take to drop in temperature but we cannot predict this without more info about the chamber, the insulation, and the room temperature. Contents inside the chamber have little effect on the rate of loss (if the pressure vessel had the liquid nitrogen in it or if it was empty has little effect in this case)

Liquid Nitrogen under this high pressure is at the surrounding temperature. It is not cold and cannot loose coldness.

Now if you were to reduce pressure, which is not what you asked, some nitrogen would convert to the gas state and this cools the vessel (latent heat of vaporization is why).

I suggest you review heat capacities and latent heats of fusion, sublimation and vaporization to learn more.

Answer 3

To maintain nitrogen in liquid form at 60deg C the pressure inside the vessel has to be very high. Since the atmospheric temperature will be lower there will be a tendency for the liquid to loose temperature but then as it looses temperature the pressure inside the vessel will increase by Boyl,s law. Ultimately a equilibrium pressure will be achieved so that the temperature loss is made up with the new increased pressure.

Answer 4

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