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125 water droplets, each of radius r, co...

125 water droplets, each of radius r, coalesce to form a single drop. The energy released raises the temperature of the drop. If `sigma ` represents surface tension,p represents density, S represents specific heat, then the rise in temperature of the drop is - `((eta +7) sigma)/(eta r p S)` where `eta ` is a dimensionless constant. Find `eta `.

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If a number of little droplets of water, all of the same radius r, coalesce to form a single drop of radius R, the rise in temperature will be given by (18 T)/( eta rho s) ((1)/(r ) - (1)/(R )) where T is the surface tension of water, rho is density of water and n is a dimensionless constant. Find eta .