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Description

The apparatus consists of two ?oor-standing interconnected rigid vessels, one equipped for operation under pressure and the second under vacuum.
An electrically operated air pump connected to the top of the vessels, together with valves and tappings enables the appropriate vessel to be
pressurised or evacuated as required to suit the teaching exercise.
The vessels can be used independently or together to enable di?erent thermodynamic processes to be evaluated. A pressure sensor connected
to each vessel and a temperature sensor inside each vessel permit the changes in the properties of the air contained within the vessels to be
monitored continuously.
Both vessels are constructed from clear rigid plastic, which a?ords light insulation between the air inside the vessel and the surroundings to
reduce heating/cooling. This also enables each vessel and its contents to return to ambient temperature reasonably quickly.
The capacity of the pressurised vessel is approximately 23 litres.
The capacity of the evacuated vessel is approximately 11 litres.