andhaving done so let us shut the stopcock, and detachthem from the pump ; you will now find it very difficultto pull the two half-spheres asunder, because while the ^0 SCIENCE PRIMERS. [PROPEKTIES ail fioiu without presses thorn together there is no jiirfrom -within to counteract this pressure,… … Fig. 15. be filled with coal gas, or, better still, vv-ith hydrogen,it will be lighter, bulk for Inilk, tlian the air, andwill therefore rise in it. Such a bag is called aballoon, and if sufficiently large it may also supporta small car containing several people. 31. Barometer. Experiment 31.—Let…
Physics
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
