Victor Meyer apparatus

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The Victor Meyer apparatus is the standard laboratory method for determining the molecular weight of a volatile liquid. It was developed by Viktor Meyer, who spelled his name Victor in publications at the time of its development. In this method, a known mass of a volatile solid or liquid under examination is converted is carefully vaporized in a tube, while measuring the volume of air displaced. The molar quantity of evaporate can then be calculated via the ideal gas law, and thence (since the mass is known) the molar mass.

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