The doubt regarding whether the pressure reduction of natural gas is endothermic or exothermic
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At 27°C and 30 MPA, the specific heat capacity of methane is 13.16 cal/g°C; at 27°C and 10 MPA, it is 11.32 cal/g°C. Can it be understood that, with the temperature remaining constant, 13.16–11.32 cal of heat is released per gram of methane when the pressure is reduced from 30 MPA to 10 MPA? But doesn’t this go against the common principle that lowering pressure leads to heat absorption? Need an explanation? !
Gas expansion is an endothermic process. This is the principle that cryogenic machines utilize