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Unlike with gases, for liquids and solids the pressure of a system can be not only positive, but also negative, or even zero. Upon isobaric heat exchange (heating or cooling) at p = 0, the volume work ( p-V ) should be zero, assuming the general validity of traditional δW = dW p = -pdV equality. This means that at zero pressure, a special process can be realized; a macroscopic change of volume achieved by isobaric heating/cooling without any work done by the system on its surroundings or by the surroundings on the system. A neologism is proposed for these dW p  = 0 (and in general, also for non-trivial δW = 0 and W = 0) processes: "aergiatic" (from Greek: Ἀεργία , "inactivity"). In this way, two phenomenologically similar processes-adiabatic without any heat exchange, and aergiatic without any work-would have matching, but well-distinguishable terms.

Pressure-Volume Work for Metastable Liquid and Solid at Zero Pressure