. The Family tutor . 64 NATURAL PHILOSOPHY Ul CHAPTER VIL PROPERTIES OF THE AIR. Marrlottes Law.—Proof for Compressions and Dilatations.—Case in which it Fails.— Resistance of the Air to Motion.—The Parachute.—The Air transmits Sound; supports Animal Life, Combustion, and Tgnition.—Exists in the pores of some Bodies and is dissolved in others. Atmospheric air being thus a highly compressible and expansible substance,we have next to inquire what is the amount of its compressibility under differentdeo-rees of force > This has been determined experimentally by diSerent philosophers,the true la
. The Family tutor . 64 NATURAL PHILOSOPHY Ul CHAPTER VIL PROPERTIES OF THE AIR. Marrlottes Law.—Proof for Compressions and Dilatations.—Case in which it Fails.— Resistance of the Air to Motion.—The Parachute.—The Air transmits Sound; supports Animal Life, Combustion, and Tgnition.—Exists in the pores of some Bodies and is dissolved in others. Atmospheric air being thus a highly compressible and expansible substance,we have next to inquire what is the amount of its compressibility under differentdeo-rees of force > This has been determined experimentally by diSerent philosophers,the true law having first been discovered by Boyle and Marriotte. The density and elasticity of air are directly as the Jorce oj compression. The volume which air occupies is inversely as the pressure upon ^t. To illustrate, and at the same time to prove these laws, we make use of a tube,adch, so bent that it has two parallel branches, a and b. It is closed at b, and hasa funnel-mouth at a. Sufficient mercury is pou
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