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3. Consider the three statistical ensembles presented in class: the microcanonical ensemble, canonical ensemble, and the grand canonical ensemble. Now consider three different systems: a stoppered flask in a water bath, a liquid enclosed in a semipermeable membrane, and a sealed, insulated box of gas. Which ensemble most accurately describes each system? Include a brief explanation for your answers. (Hint: think about whether the number of particles is changing, the energy is changing, or both.)