Effects of pressure — task. Science CBSE, Class 8 New.

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Answer the following:

When a gas is cooled and pressure is increased, its particles come very close together and it changes into a liquid.

i. Liquefaction of a gas can be achieved by

increasing temperature and increasing pressure
decreasing both temperature and pressure
decreasing temperature and increasing pressure
increasing temperature and decreasing pressure

ii. Liquefaction of gases shows that

liquids cannot evaporate
only solids have fixed shape
state of matter can change with pressure and temperature
gases cannot be compressed

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