Change of State of Gases (SMT-HT-02)

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Experimental investigation of gas laws.
Transparent measuring tank 1 for investigation of
isothermic change of state.
Hydraulic oil filling for changing volume of test gas.
Built-in compressor generates necessary pressure
differences to move the oil volume.
Compressor can also be used as vacuum pump.
5/2-way valve for switching between compression
and expansion.
Transparent measuring tank 2 for investigation of
isochoric change of state.
Electrical heater with temperature control in tank 2.
Sensors and digital displays for temperatures,
pressures and volume.
Technical specification

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Gas laws belong to the fundamentals of thermodynamics and are dealt with in every training
course on thermodynamics. The SMT-HT-02 experimental unit enables two changes of state
to be studied experimentally: isothermal change of state, also known as the Boyle-Mariotte
law, and isochoric change of state, which occurs at constant volume. Transparent tanks
enable the change of state to be observed. Air is used as the test gas. In the first tank,
positioned on the left, the hermetically enclosed air volume is reduced or increased using a
compressor and hydraulic oil. This results in an isothermal change of state. The compressor
can also operate as a vacuum pump. If the changes occur slowly, the change of state takes
place at an almost constant temperature. In the second tank, positioned on the right, the
temperature of the test gas is increased by a controlled electric heater and the resulting
pressure rise is measured. The volume of the enclosed gas remains constant. Temperatures,
pressures and volumes are measured electronically and digitally displayed.