Evaporation is increased in a dry atmosphere.
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It is difficult for water to evaporate when humidity is high because of water saturation in the surrounding environment.
Water can still evaporate when the humidity is high, but the rate of evaporation is slower compared to when the humidity is low. This is because the air already has a high water vapor content, making it more difficult for additional water molecules to escape into the atmosphere.
High humidity can decrease the efficiency of water cooling systems by reducing the rate of evaporation, which is essential for cooling. This can result in higher temperatures and reduced cooling capacity. It can also lead to corrosion and mold formation within the system.
It is unlikely for a cup of water to completely evaporate in just a few hours unless the conditions are extreme, such as very high temperatures or low humidity. However, some water might evaporate over time depending on the environment it's in.
Relative Humidity is measured with a HygrometerHumidity is the amount of water vapor in the air.On hot days, when it feels sticky, the humidity would then be high.