Practical Tropical Sanitation a Manual for Sanitary Inspectors And Others Inte
Practical Tropical Sanitation a Manual for Sanitary Inspectors And Others Inte
W Alexander Muirhead
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(32° F. ), - and boils at 100 C. (2i2°F. ) under normal conditions. The latent heat of water, i. E. The amount used to convert it from ice, is 80 thermal units, and the latent heat of steam is 536 thermal units. (The British thermal unit is the amount of heat required to raise i lb. Of water through 1° F. ) Water is taken as the standard of comparison in regard to density or specific gravity, and specific heat. QUANTirV OF WATER REQUIRED 137 One cubic foot (measuring- approximately 61 galls. ) ...weighs looo ozs. One gallon weighs lo lbs. , and one foot 'head' exerts a pressure of -434 lb. On the square inch. It evaporates at all temperatures under varying conditions. It is one of the best known solvents, dissolving the majority of known substances ; the relative solubility of such substances varies enormously, and the solubility of each one is affected by temperature. Quantity of Water Required. This is reckoned as so many gallons per head per day, and is usually a liberal scale based on the require- ments for drinking, cooking, washing of persons, clothing, and utensils, watering of animals, cleansing of houses, yards, and streets, manufacturing purposes, for sewage removal, where a water-carriage system exists, etc.
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