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What is exactly the 'pressure' of a solid in thermodynamics?

Most literatures on thermodynamics are written or started with the language of 'ideal gas'.

This confuses me a lot when I switch to consider solids. For example, the enthalpy of a system
is defined as H = U + P*V, where P is the pressure of the 'system'. This definition is found to be convenient
when dealing with gas. But in terms of solids, I really doubt if the 'pressure' is meaningful. The volume makes
sense but its relation with energy should be expressed in another way when we consider for example cold-

So I wonder what is the counterpart of P in the case of solids (or even liquids). Further more, I wonder the way
to define enthalpy, Gibb's energy,  intrnal energy, for solids.

thank you!

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