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Products  |  Thermal Engineering and HVAC  |  Fundamentals of Thermodynamics  |  WL 102
WL 102 Change of State of Gases Show data sheet (pdf file) Print page
Technical Description

  Familiarity with the gas laws is a fundamental requirement of any training course in thermodynamics.
  The WL 102 unit enables two changes of state to be studied experimentally: Isothermic change of state, also known as the Boyle-Mariotte Law, and isochoric change of state, which occurs at a constant volume. Transparent vessels enable the change of state to be observed. Air is used as the test gas.
  In vessel 1, positioned on the left, the enclosed air volume is reduced or increased using a compressor and hydraulic oil. This results in an isothermic 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 vessel 2, 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, digitally displayed and transferred to a PC for processing.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments
- demonstrating the laws of state changes in
  gases experimentally
- isothermic change of state,
  Boyle-Mariotte Law
- Isochoric change of state,
  Gay-Lussac’s 2nd Law

* Isothermic and isochoric change of state of air1
* GUNT software for acquisition, processing and

  display of measured data


[1] experimental investigation of gas laws
[2] transparent measuring vessel 1 for investigation of isothermic change of state
[3] hydraulic oil filling for changing volume of test gas
[4] built-in compressor ensures necessary pressure differences to move the oil volume
[5] compressor can also be used as vacuum pump
[6] 5/2-way valve for switching between compression and expansion
[7] transparent measuring vessel 2 for investigation of isochoric change of state
[8] electrical heater with temperature control in vessel 2
[9] sensors for temperatures, pressures and volumes
[10] digital displays for temperatures, pressures and volumes
[11] GUNT software for data acquisition via USB under Windows Vista or Windows 7


Technical Data

Compressor / vacuum pump
- power output: 60W
- delivery side: 2bar
- intake side: 213mbar
Temperature controller: PID, 300W, limited to 80°C
Temperature measuring range
- vessel 1: 0...80°C
- vessel 2: 0...80°C
Pressure measuring range
- vessel 1: 0...4bar absolute
- vessel 2: 0...2bar absolute
Volume measuring range
- vessel 1: 0...3L


Dimensions and Weight
LxWxH: 900x550x900mm
Weight: approx. 45kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery

1 experimental unit
1 GUNT software CD + USB cable
1 vessel with hydraulic oil
1 feed hopper
1 set of instructional material

Order Details

060.10200  WL 102  Change of State of Gases

© 2005 G.U.N.T. Gerätebau GmbH