By J DORMAN STEELE
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Extra info for Answers to the practical questions and problems in physiology, philosphy, astronomy and chemistry
Put the ice in a vessel, The non-conducting wooden vessel prevents the ice from absorbing heat from the external air, and the conducting tin vessel enables it to absorb the heat from the cream. 1 7. Why does the temperature generally moderate when the snow falls ? The vapor 19. passing into the solid form gives off heat. Why does sprinkling a floor with The water water cool the air? turning to vapor absorbs heat. 20. How low a degree of temperature can be reached with a mercurial thermometer ? Nearly to the freezing point of mercury, 21.
6280 26,400 ft. ft. -i- x5 = 26,400 ft. ft. ) 4700 How much louder will be the report of a gun to an 13. observer at a distance of 20 rods than to one at half a mile? 160 rod? are 8 times 20 rods. The intensity of the sound is inversely as the 1 Hence the sound is 64 times louder to the square of the distance = /64 . observer at 20 rods that to the one at half a mile. 14. Does sound travel faster at the foot or at the top of a mountain ? The density and elasticity of the air vary in the same proportion hence if the temperature were the same on the top of a mountain that it is at the foot, the velocity of sound would ; be the same, but as 15.
Turning to vapor absorbs heat. 20. How low a degree of temperature can be reached with a mercurial thermometer ? Nearly to the freezing point of mercury, 21. , 70*- 32'=38. 8=126*. what 39 F. is it C. r C. , 126" what is it F. +32=158* P. Will dew form on an iron bridge f Yes, because iron is a good radiator. 22. On a wooden Not brid&tt f so readily, because wood is a poorer radiator. Why will not corn pop when very dry ? pores shrink, and the corn becomes compact; porous, tender-celled corn will pop.