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A well insulated cylinder with a low thermal mass and conductivity piston. The top of the piston's con rod, instead of a handle, has a weight cup. (included P and T sensors)
Trial A; continuously and slowly add small weights 'till the V is, say, 1/10 the original.
Trial B dump the weights in all at once (a single weight = in mass to the above ones)
discussion: P and T and from the discussion S will differ, but the work mgh will be the same.