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8CIEN CE. were used we might get something analogous to entropy, and which, nevertheless, would possess different and possibly interesting properties. Professor Durand has discussed two special forms which the integrating factor might take for a perfect gas. One of these is where i t is a function of the pressure only, and the other in which it js a function of the volume only.doi:10.1126/science.5.112.317 fatcat:ekpxsssy4fg7livlw7e5dgee4u