Diagram of the Apparatus to Estimate the Molecular Weight of Thorium Emanation


Diagram of the apparatus to estimate the molecular weight of thorium emanation. The long cylindrical chamber was divided in two by a sliding metal gate. With the gate closed, thorium emanation filled the left chamber. Then the gate was opened. The time it took for the emanation to diffuse through the chamber (given the kinetic theory of gases) was used to calculate (roughly) the molecular weight of the emanation.

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