A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 25
? 25. What is Porosity ? 26. How is water proved to be porous ? Whydoes hot water receive more salt and sugar than cold ? How may it be proved thatgranite is porous ? How is the porosity of iron proved ? 27. Give an account of theexperiment by which the porosity of gold was proved. How small pores… … duced. A sponge, for instance, by the simple pressure of thehand, can be reduced to one-tenth of its natural size. In likemanner, if the pores of a body are made larger by any agency(as they are by heat), its size is proportionately increased.30. All bodies possess these properties. A rod of…
Physics
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