Abstract
When a gas or vapour molecule strikes a solid surface it may either condense on the surface and remain there for some time before returning to the gas phase, or it may rebound at once from the surface. The ratio of the number of molecules condensing on any surface per second to the total number incident on that surface per second may be defined as the “coefficient of condensation”
f
. The value of this coefficient will be expected to vary with the nature of the solid surface and of the gas but in a number of cases (Langmuir 1916) early evidence indicated that it is close to unity and it has sometimes been assumed that this is always so. The experiments described in the present paper were designed to test the correctness of this assumption, and for this purpose the coefficient of condensation has been measured at a number of crystal surfaces. The measurement can be made very directly in the special case in which the solid and the gas molecules are identical in nature, and for this reason crystals which sublime at ordinary temperatures have been used and
f
has been measured for the collisions of the vapour molecules with a solid surface of the same substance.
Cited by
18 articles.
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