Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
e in the flask above the water is (by thecold water) condensed; thereby producing apartial vacuum, which diminishes the pressureon the surface of the water ; thus proving thatliquids under less pressure boil with less heat.This is shown, also, by placing water, heated to less than 212°, underthe… … HEAT. 181 310. Useful applications of boiling water under dimin-ished pressure are made in concentrating vegetable extracts, cane-juice (sugar), etc., and consequently at a temperature below that whicliwould injure the substances treated. Boiling point affected by altitude.—On ascending moun-tains,…
Physics · Astronomy
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