Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 166
tervessel, 212° F. Pure waterboils at 212° F., no matterhow fiercely the fire is burn-ing ; therefore in boiling foodit is economy to use a firewhich keeps the water justboiling. Any greater amountof fire is wasted in boilingaway the water. When water has any sub-stance dissolved in it, it boils at… … FIG. 99.— The double boiler. The foodin a is cooked by heat received fromthe water c and the steam b. EXERCISES 1. Explain why liquids evaporate. 2. Explain why evaporating water cools surrounding objects. 3. When is air said to be saturated with water vapor? 4. Explain why clothes dry more rapidly…
Physics · Home Economics
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