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The amount of heat added to the system is the integral of the specific heat wrt temperature: $$ Q = \int C(T)dT $$ So in the link you give it's just the area under this graph: Although it's true that the specific heat tends to infinity at the lambda point it does so sufficiently suddenly that the area under the graph remains finite. That means the ...


It means that all atoms are in the ground state, then since potential energy is defined up to a constant you can say ground state has zero energy

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