Archive for July 8th, 2010
Containers Fill
Containers Fill
why do water droplets form on the outside of containers filled with something cold?
Books tell me it's condensation, but that's not too much to go with. Thanks.
It is condensation, so what would help in explaining further is an understanding of dew point.
All air contains water vapor of varying quantities. The dew point indicates the amount of moisture in the air. The higher the dew point, the higher the moisture content of the air at a given temperature. Conversely, the dew point of humid air will be higher than the dew point of dry air.
Dew point temperature is defined as the temperature to which the air would have to cool (at constant pressure and constant water vapor content) in order to reach saturation. A state of saturation exists when the air is holding the maximum amount of water vapor possible at the existing temperature and pressure.
Condensation of water vapor begins when the temperature of air is lowered to its dew point and beyond. The dew point, like other measures of humidity, can be calculated from readings taken by a hygrometer.
Since the cool matter inside the container causes a lower temperature than the surrounding air, it brings the air in contact with the surface below its dew point, the water vapor leaves the gaseous state and collects water droplets on the surface of the container.
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