The magnetocaloric effect is defined by the temperature variation observed in a material under adiabatic conditions when the applied magnetic induction field B varies. The effect becomes particularly large when the material undergoes a phase transition due to the magnetic induction field variation. An application of this effect wasA parallel plate capacitor is made of metals 1 and 2 which have electrochemical potentials ¯μ₁ and ¯μ₂ and chemical potentials μ₁ and μ₂. On the left, the plates are not connected and the electrochemical potentials are not equal. On the right, when conduction electrons of charge e (sign included) are allowed to flow, the electrochemical potentials are equal. If the spacing d varies over time, electric charges flow through the resistance R and a voltage V can be measured. considered for space exploration [135]. The applied magnetic induction field may be produced by permanent magnets [136]. Show that the infinitesimal temperature variation dT during an adiabatic process characterised by an infinitesimal magnetic induction field variation dB at constant pressure is given by,where c_B is the specific heat per unit volume at constant magnetic induction field B.

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