To change a liquid to a gas energy must be what

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

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warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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