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Spherical bubbles of diameter 3 mm are observed in the bubble boiling phase of water at 1 atmosphere pressure. Assuming pure water vapour is present inside the bubbles, calculate the temperature of that vapour. Given Surface tension = 73mN/m R/pgfg = 0.000014

Spherical bubbles of diameter 3 mm are observed in the bubble boiling phase of water at 1 atmosphere pressure. Assuming pure water vapour is present inside the bubbles, calculate the temperature of that vapour. Given Surface tension = 73mN/m R/pgfg = 0.000014 Correct Answer 119.387 ℃

Tv – Tsat = (2 σ/r – pg) Rv Tv2/pv hfg is the required equation, here as we do not have any condensable gas present, pg=0, hence the equation becomes Tv – Tsat = (2 σ/r) Rv Tv2/pv hfg representing as a quadratic we get, 0.00136 Tv2 – Tv + 100 = 0 Shift+Solve on Scientific calculator gives us 119.4℃

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