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The volume of the gas will decrease.

The gas molecules move faster when they are warmer, because more heat equates to more energy. The faster they move, the more space they will take up and the greater the volume. Therefore, if the temperature goes down, they have less energy and take up less space.

This is shown in the ideal gas law:

PV = nRT

P = Pressure of the gas

V = Volume

n = mols of the gas

R = ideal gas constant (8.314 J/molK)

T = Temperature

As you can see, if temperature is decreased and only pressure is allowed to change, with all other variables remaining constant, volume will also have to decrease to maintain the proportion.

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Q: What happens to volume if the temperature of a gas is decreased from 60 degrees Celsius to 30 degrees Celsius?
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