An ebulliometer is designed to accurately measure the
boiling point
The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.
The boiling point of a liquid varies depending upon the surrounding env ...
of liquids by measuring the temperature of the vapor–liquid equilibrium either
isobarically
In thermodynamics, an isobaric process is a type of thermodynamic process in which the pressure of the system stays constant: Δ''P'' = 0. The heat transferred to the system does work, but also changes the internal energy (''U'') ...
or
isothermally.
The primary components in a
Świętosławski ebulliometer, which operates isobarically, are the boiler, the
Cottrell pumps, the
thermowell, and the condenser. Such an ebulliometer can be used for extremely accurate measurements of boiling temperature, molecular weights, mutual solubilities, and solvent purities by using a
resistance thermometer (RTD) to measure the near-equilibrium conditions of the thermowell.
The ebulliometer is frequently used for measuring the alcohol content of dry wines. See also
Sweetness of wine and
Oechsle scale.
References
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Laboratory equipment
Science and technology in Poland
Polish inventions
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