A Text-Book of Practical Physics / By William Watson
A Text-Book of Practical Physics / By William Watson
Watson William
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Two similar thermometers are generally fixed on a stand, the one being used to give the temperature of the air. The bulb of the other is surrounded with muslin, which is kept moist by a piece of lamp wick which dips in a vessel containing water. The drier the air, the more rapid the evaporation of the water on the wet bulb, and hence the greater the difference in the readings of the two thermometers. The rate of evaporation of the water, however, does not depend exclusively on the hygrometric s...tate of the air, but also on the nature of the surroundings of the thermometers, and more particularly whether the air in the neighbourhood of the wet bulb is in motion or not. If t w = the temperature given by the wet bulb thermometer, t d = the temperature of the air as given by the dry bulb thermometer, F w = the maximum tension of water at the temperature t w, B = the height of the barometer in millimetres, then the actual tension of the water vapour present in the air is given by where c is a constant depending on the nature of the surroundings.
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