. A text book of physics, for the use of students of science and engineering . hecorrected head h0 is given by : //„ =ha +hw - (j Ihiotw +h« ( 2 J | ?Repeat ths experiment at intervals of about 10° C. up to the rangers Fig. 432.—Maximum vapourpressure at lower temperatures. k li, in ml, IV xxxiv MAXIMUM VAPOUR PRESSURE 453 of the instrument. Plot a graph showing the relation of the maximumvapour pressure and temperature of aqueous vapour. Expt. 101.—Maximum pressure of aqueous vapour at higher tempera-tures. The apparatus employed is shown in Fig. 433. The bent tube at Acontains mercury standi
. A text book of physics, for the use of students of science and engineering . hecorrected head h0 is given by : //„ =ha +hw - (j Ihiotw +h« ( 2 J | ?Repeat ths experiment at intervals of about 10° C. up to the rangers Fig. 432.—Maximum vapourpressure at lower temperatures. k li, in ml, IV xxxiv MAXIMUM VAPOUR PRESSURE 453 of the instrument. Plot a graph showing the relation of the maximumvapour pressure and temperature of aqueous vapour. Expt. 101.—Maximum pressure of aqueous vapour at higher tempera-tures. The apparatus employed is shown in Fig. 433. The bent tube at Acontains mercury standing in both limbs, and the space in the closedshorter limb contains some water and water vapour only. The tube isimmersed in a beaker B containing glycerine, the temperature of whichcan be raised, with care, considerably above 100° C. The tube A is con-nected to a reservoir C containing air, and the reservoir is connected toa U gauge D containing mercury, and also to an air pump (not shown inFig. 433) by means of which air may be forced into the apparatus. To pump. Fig. 433.—Maximum vapour pressure at higher temperatures. The glycerine bath is brought to the temperature of 100° C, as shown)y the thermometer E, and the mercury surfaces in the limbs of A are>rought to the same level. During this operation the pump is disconnectedmd the connection is left open to the atmosphere ; hence the pressurem both surfaces in A will be that due to the atmosphere, and will be foundy reading the barometer. Connect the pump again and raise the tempera-ure of the bath to say 105° C. ; pump in a sufficient quantity of air toestore the mercury to the same levels in A ; this level had been disturbedy the increasing aqueous vapour pressure in the shorter limb. Whenhe conditions are steady, read the difference in levels in the gauge D, andbtain the maximum vapour pressure corresponding to the temperaturen the bath by adding this difference to the barometer reading. Repeat the experime
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