By Shapley H.
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Additional resources for A Note on the Simple Device for Increasing a Photographic Power of Large Telescopes (1920)(en)(4s)
5). We have so far considered work done by a hydrostatic pressure on a fluid. In general other forms of work may occur. 14) one must allow for all these forms of work. Correspondingly one then defines other heat capacities with the appropriate parameters held constant. 4 MAGNETIC WORK For the study of the magnetic properties of matter, one requires the expression for the work of magnetizing a material. We shall now derive this. We shall consider a process in which an initially unmagnetized sample of material is magnetized by applying a magnetic field to it.
Because of its large heat capacity, the temperature of the heat bath stays constant in spite of heat exchange with the system. The system is then also at the same constant temperature when in thermal equilibrium with the heat bath. To perform the compression quasistatically, the weight on the piston must be increased in a large number of very small increments. After each step we 34 must wait for thermal and mechanical equilibrium to establish itself. At any instant the pressure of the gas is then given from the equation of state in terms of the volume V, temperature T and mass M of gas.
44), we recognize the second term in Eq. 41b) as the work done in generating the mutual field energy. 41b) is the work done in magnetizing the sample, exclusive of establishing the mutual field energy. e. we do not count the vacuum field energy as part of the system. 44) as part of the system or not. If it is excluded, we see from Eq. 45) If we include it as part of the system, we obtain from Eq. e. we take into account that we can change the energy of a system by doing work on it or by heat transfer.
A Note on the Simple Device for Increasing a Photographic Power of Large Telescopes (1920)(en)(4s) by Shapley H.