Creighton, William Henry Paul, 1859- · New York, J. Wiley & sons; [etc., etc.] · leaf 164
is 7r= 1fiq =1.406. X for moist air has some value between 1.4 and 1.2. The equation PVr = C may be easily derived from the twofundamental equations of thermodynamics derived on page 152: H=KpdT-VdP,H = KvdT+PdV. When the expansion is adiabatic H = 0: KpdT=VdP,KvdT= -PdV,Kj,= VdP Kv r~ PdVdVdP ry-… … Fig. 94. Differentiate PV»=C. VndP + nP7n~ldV = 0 is the equation of the tangent. jt> i>dV dP P dP= —nP-yr, or ly—~ny- From the figure, md o From similar triangles, dPmd dV c?e md m cd _de cd de abbe = — n also. The minus sign shows that the angle, <j>, that the tangent makeswith the A…
Steam-engines · Heat-engines
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