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單項選擇題

The weight of liquefied petroleum gas vapors as compared to air is（）.

A.variable
B.the same
C.lighter
D.heavier

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單項選擇題

The vapor pressure of a substance（）.

A.decreases as temperature increases
B.increases with the temperature
C.is not affected by temperature
D.may increase or decrease as the temperature rises

單項選擇題

The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.

A.soluble state
B.solid state
C.liquefied state
D.inert state

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