Why gases such as hydrogen and heleium are not liquefied at room temperature by applying very high pressure?

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Solution

Because their critical temperature are lower than room temperature. Gases cannot be liquefied above the critical temperature by applying very high pressure.

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Similar questions

The critical temperature of ammonia and hydrogen are 405.5K and 33.2K respectively. Ammonia can be liquefied at room temperature just by compression of the gas at high pressure. Liquifaction of hydrogen , on the other hand, requires cooling as well as compression. (True/False)

Q. In the following statements:
(A) Ideal gases are liquefied only at very low temperatures.
(B) Ideal gases cannot be liquefied.
(C) Ideal gas behaviour is observed by real gases at low pressures.
(D) Ideal gases do not exist.
The correct statements are:

Q. Gas

A

can be liquefied at room temperature by applying pressure but gas

B

cannot. This reflects.

Q. Applying pressure and reducing temperature can liquefy gases.

Consider the following statements.

I. Gaseous substances whose critical temperatures are above room temperatures can be liquefied by applying sufficient pressure to the gas.

II. Gaseous substances whose critical temperatures are below room temperature can be liquefied by the application of pressure and lowering of temperature below $T_{c}$ .

Select the correct alternate.

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