Science: NS Fluid

One advantage of the hot water heating system over steam and hot air systems is that hot water retains its heat longer than do steam or air. Hot liquids in general are better storers of heat than are vapors or gases. But it is difficult to raise the temperatures of liquids to very high, useful heats. Chemical engineers obtain controlled temperatures of about 900° F. with an organic substance, diphenyl. Highest degree to which water can go and remain water is 698° F. Its pressure against pipes is then almost 2,900 lb. per sq....

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