What is the reason for the higher rate of evaporation in cold saltwater compared to cold freshwater?

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The rate of evaporation is generally higher in saltwater compared to freshwater, even when both are cold, due to differences in their vapor pressure.

Vapor pressure is the pressure exerted by a vapor when it's in equilibrium with its liquid state at a given temperature. Saltwater has lower vapor pressure than freshwater at the same temperature. This means that saltwater molecules are less likely to escape into the vapor phase compared to freshwater molecules.

However, when both are cold, the difference in vapor pressure between saltwater and freshwater decreases, but saltwater still tends to evaporate faster due to its higher concentration of dissolved salts. These salts disrupt the hydrogen bonding between water molecules, making it easier for them to escape into the vapor phase.

Therefore, even in cold conditions, the higher concentration of dissolved salts in saltwater promotes faster evaporation compared to freshwater.

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