# Fill Vacuum

The above left is a thermal insulating box separated by a divider, with one part filled with ideal gas and the other vacuum. Now, as in the above right, we remove the divider so that the ideal gas fills the whole box uniformly. Which of the following is NOT correct?

a) The temperatures of [A] and [B] are the same.

b) The internal energies of [A] and [B] are the same.

c) The entropy of the gas of [A] is larger than that of [B].

d) The change from [A] to [B] is an irreversible process.

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