Abstract

A new method has been developed for the investigation of the condensation from supersaturated vapor on substrates by the adiabatic compression of a saturated vapor gas. The condensation was detected by light scattering, measured with a photomultiplier. A maximum critical supersaturation of about 42% at room temperature ( t = 20°C) was found for water condensation on hexadecane. This value was shown to be 2.5 times less than the value to be expected according to the prevailing interpretation of heterogeneous phase formation, following Volmer's pattern. But, when taking into account the linear tension of the nucleus lens perimeter, good agreement was obtained with the critical supersaturation found at a linear tension of about −0.8 × 10 −5 dyne. Equations for the work of formation of a liquid nucleus on a liquid substrate, deduced in the paper, underlie the discussion.

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