Explanation Refer to table A-4, obtain the saturation pressure of water at 20 ° C as 2.339 kPa and at 15 ° C as 1.706 kPa. Since the vapour pressure of the water surface is the saturation pressure of water at given temperature of 15 ° C , calculate the vapour pressure of water surface. P ν , water surface = P sat @ T water = P sat @ 15 ° C (I) Here, the saturated pressure at 15 ° C is P sat @ 15 ° C . Since the air in the room is not saturated, calculate the vapour pressure in the room. P ν , air = ϕ P sat @ T air = ϕ P sat @ 20 ° C (II) Here, the saturated pressure at 20 ° C is P sat @ 20 ° C and relative humidity is ϕ

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Thermodynamic Relations

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Chapter 3.8, Problem 104P

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The vapour pressure at the water surface and vapour pressure in the room.

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Chapter 3.8, Problem 103P

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The vapour pressure at the water surface and vapour pressure in the room.

Solution Summary: The author compares the vapour pressure at the water surface and the vacuum pressure in the room. The saturation pressure of water at 20°C is 2.339 kPa.

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The vapour pressure at the water surface and vapour pressure in the room.

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