Question

List any two ways by which a gas can be converted into A liquid

Answer 1

Gas can be converted to liquid by the process of liquefaction. It can be done in two processes:

1) By decreasing the temperature
2) By increasing the pressure.

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Answer 2

the two ways are gas converted into a water 

[1] decreacing the temprature

[2] increase preassure

the process which gas converted into a water is known as liquidfication .