Laboratory manual in physics . that when water evaporatesfrom the hand, the hand is are now ready to explain fully theeffect produced by leaving off the lidof a kettle while the water is comingto a boil. If a kettle boiled long enough tosaturate all of the air in the room,would further evaporation take placefrom the kettle? HeatEXPERIMENT No. 21 Question.—Why is it that anegg cannot be boiled hard on thetop of a high mountain? Apparatus.— Air pump; tallreceiver; glass beaker; ther-mometer. Directions.— Fill the beakerabout one-third full of water andbring to a boil. Note the ternper
Laboratory manual in physics . that when water evaporatesfrom the hand, the hand is are now ready to explain fully theeffect produced by leaving off the lidof a kettle while the water is comingto a boil. If a kettle boiled long enough tosaturate all of the air in the room,would further evaporation take placefrom the kettle? HeatEXPERIMENT No. 21 Question.—Why is it that anegg cannot be boiled hard on thetop of a high mountain? Apparatus.— Air pump; tallreceiver; glass beaker; ther-mometer. Directions.— Fill the beakerabout one-third full of water andbring to a boil. Note the ternperature of the boilingwater. Transfer thebeaker to the air pumpand arrange the appa-ratus as shown in thediagram, with the ther-mometer passingthrough a stopper in thetop of the receiver andthe bulb of the ther-mometer in the very careful not tobreak the air until thewater begins to the temperature,also the reading of thepressure gauge attachedto the pump. Repeatthe operation every 43. 44 Laboratory Manual in Physics minute or so until a half dozen or more results havebeen obtained. Results.—Tabulate your results showing the vary-ing temperatures and pressures at which the waterboils. Calculate the change in pressure necessary toproduce a change of 1° C. in the boiling point of water. Discussion.— How would you devise a cookingutensil that would boil eggs on top of a high mountain? When an engine boiler gives way, why does thewater sometimes change instantaneously into steamwith great violence? Problem.— On the top of Pikes Peak the barom-eter stands commonly at inches. At whattemperature does the water boil? EXPERIMENT No. 22 Problem.— How much ice is needed to cool a liter ofwater at 40° C. to 5° C? Test it and compute theheat of fusion of ice. Apparatus.—-Calorimeter or tin can; ice; ther-mometer. Directions.—Weigh the dry calorimeter. Put intoit 1 liter (1 kilogram) of water heated to a little above40° C. When
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1912
