Estimate the lowest temperature T that can be achieved by evaporation cooling of liquid 4He if the cooling load is 0.1 W aid the Vacuum pump has a pump speed S = 102 liter s–1. Assume that the helium vapor pressure above the boiling helium is equal to the equilibrium vapor pressure corresponding to Tmin and assume that the helium gas warms up to room temperature and expands accordingly before it enters the pump.
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