The London, Edinburgh and Dublin philosophical magazine and journal of science . at P. The true maximum pressure of the explosion is takenas that indicated by P after applying a correction for cooling,which correction is taken from the cooling curve 2 3. Theheat generated in the explosion and the initial pressure andtemperature are known ; the maximum temperature can beobtained from the gas equation pv = RT. The mean specificheat for the burned gases can then be found by the point of view of this paper this method is * For present state of knowledge of Specific Heats see Briti
The London, Edinburgh and Dublin philosophical magazine and journal of science . at P. The true maximum pressure of the explosion is takenas that indicated by P after applying a correction for cooling,which correction is taken from the cooling curve 2 3. Theheat generated in the explosion and the initial pressure andtemperature are known ; the maximum temperature can beobtained from the gas equation pv = RT. The mean specificheat for the burned gases can then be found by the point of view of this paper this method is * For present state of knowledge of Specific Heats see British Asso-ciation Keports of Gaseous Explosions Committee 1908, and subsequentyears. Boltzmann s JEquipartition Hypothesis. 751 interesting because the gases are under very rapid change oftemperature. Suppose Oab (fig. 3) to represent an ideal pressure-timecurve for an explosion throughout which static equilibriumhas been established at each point. We can consider theeffect of a lag in the gas in reaching this equilibrium state. Fiff. During the explosion period an excess amount of energy willbe in the form of internal molecular energy, since this is thefirst result of chemical action, translational motion cominglater. The actual pressure curve 01 will therefore fall belowthe ideal. At time al explosion is complete, but the gas hasnot yet attained an equilibrium state. As this equilibriumstate is established, the pressure rises to ultimate coincidencewith ah. It will be observed that the producing of 01 and12 to P gives too low a maximum pressure and consequentlytoo high a value of the specific heat. This is borne out byresults ; comparing specific heats obtained by this methodwith those obtained by the constant pressure method, it isfound that the explosion method gives values as much as10 per cent, higher than the other. Mallard and Le Chatelierand Langen have used the explosion method. It should benoted that lag in the gas in attaining its equilibrium stategives an explana
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
