## Heat transfer to a liquefied gas.

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Yu Chong 2H
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Joined: Fri Sep 29, 2017 7:05 am

### Heat transfer to a liquefied gas.

A gas is liquefied in a container due to high pressure, why is there heat transferred if there is now a hole in the container and the pressurized liquid escapes as a gas?

Yeyang Zu 2J
Posts: 58
Joined: Fri Sep 29, 2017 7:06 am

### Re: Heat transfer to a liquefied gas.

I think it is because vaporization always happens with lost of energy of the liquid.

Rachel Formaker 1E
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### Re: Heat transfer to a liquefied gas.

When the pressurized liquid escapes as a gas, it undergoes a phase change where it changes from liquid to gas.
Enthalpy of vaporization is always positive, meaning that heat is required to change the phase from liquid to gas. So heat is absorbed by the liquid as it changes into the gas phase while it escapes the pressurized container.

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