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While a liquid substance is turning into vapor, the heat given by the surroundings is -increasing...

While a liquid substance is turning into vapor, the heat given by the surroundings is

-increasing abruptly up to a typical maximum.

-approximately constant during the process.

-used to change both liquid's and vapor's temperatures.

-approximately zero, according to the theory.

-used to move molecules from one phase to the other.

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