. A course of six lectures on the chemical history of a candle [electronic resource]: to which is added, a lecture on platinum. Fig. 25. which we can force the air into this bottle, andwith it we will force in a certain number of 120 METHOD OP WEIGHING GASES. volumes of air as measured by the pump.[Twenty measures were pumped in.] We willshut that in, and put it in the balance. Seehow it sinks; it is much heavier than it what? By the air that we have forced intoit by the pump. There is not a greater bulk ofair, but there is the same bulk of heavier air,because we have forced in air upon
. A course of six lectures on the chemical history of a candle [electronic resource]: to which is added, a lecture on platinum. Fig. 25. which we can force the air into this bottle, andwith it we will force in a certain number of 120 METHOD OP WEIGHING GASES. volumes of air as measured by the pump.[Twenty measures were pumped in.] We willshut that in, and put it in the balance. Seehow it sinks; it is much heavier than it what? By the air that we have forced intoit by the pump. There is not a greater bulk ofair, but there is the same bulk of heavier air,because we have forced in air upon it. Andthat you may have a fair notion in your mind. Fig. 26. as to how much this air measures, here is a jarfull of water. We will open that copper vessel WEIGHT OF THE ATMOSPHERE. 121 into this jar, and let the air return to its formerstate. All I have to do now is to screw themtightly together, and to turn the taps, whenthere, you see, is the bulk of the twenty pumpsof air which I forced into the bottle ; and tomake sure that we have been quite correct inwhat we have been doing, we will take thebottle again to the balance, and if it is nowcounterpoised by the original weight, we shallbe quite sure we have made our experimentcorrectly. It is balanced; so, you see, we canfind out the weight of the extra volumes of airforced in in that way, and by that means we areable to ascertain that a cubic foot of air weighs1^ oz. But that small experiment will by nomeans convey to your mind the whole literaltruth of this matter. It is wonderful how itaccumulates when you come to larger bulk of air [a cubic foot] weighs 1} do y
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectchemistry, bookyear18
