Measurement of saturated vapour pressures

Fundamentally there are two methods by which saturated vapour pressures of a pure substance can be determined, namely 

In the Houben-Weyl manual, Kienitz [30] gives a detailed description of how the measuring should be done. Methods and apparatus for the determination of low vapour pressures are reported by Milazzo [31]. He shows that the McLeod manometer yields very satisfactory results with pressures in the range of 10 to 10 torr. 

As the experimental execution of the static method is rather difficult, particularly at high temperatures, whilst pressure control presents no difficulty with the accurate regulators now available, the dynamic method will generally be chosen. It is important that the substance to be examined should be checked for puritj.  

For an accurate measurement of the boiling point it is essential for the boiling 

Differential ebuUiometer (semi-micro form for 10 — 12 ml) (Swigtoslawski) 

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To determine the molecular weight of a vapour from measurements of saturation vapour pressure and of the heat of evaporation. 

General arrangement for the measurement of saturated vapour pressures with the apparatus of von Weber... 

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