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Phase Transformations

Problem 2.207

Find the specific volume of saturated water vapour under standard pressure if a decrease of pressure by Δp=3.2kPa\Delta p=3.2 \mathrm{kPa} is known to decrease the water boiling temperature by ΔT=0.9 K\Delta T=0.9 \mathrm{~K}.

Reveal Answer
Vsv′≈qΔT/TΔp=1.7 m3/kg, where q is the specific heat of vaporization, T = 373KV_{s v}^{\prime} \approx q \Delta T / T \Delta p=1.7 \mathrm{~m}^{3} / \mathrm{kg}, \text { where } q \text { is the specific heat of vaporization, T = 373K}
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