Question

How can the specific heat capacity of saturated water vapour be negative?

Answer 1

The specific heat capacity refers to the amount of heat required to cause a unit mass(say a gram or a kilogram) of a substance to change its temperature by 1°C. If the amount of heat required is positive, it means that the substance gained thermal energy from the surroundings, e.g when water changes into water vapour. This can be termed as positive specific heat capacity. But when the amount of heat required is negative, it means that the substance released thermal energy into the surroundings, e.g when water vapour changes back into the water.
 

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