Key Features:

• Self-contained bench-top module
• Demonstrates Gay-Lussac’s law relating pressure and temperature of an ideal gas (air)
• Simple and safe – needs no tools, uses low pressures and a thermally-insulated heater
• Includes thermocouples and a pressure sensor connected to a digital display
• Electronic controller to accurately regulate temperature
• Can connect to TecQuipment’s Versatile Data Acquisition System (VDAS®)

Description:

• The bench-mounting equipment includes a back plate
  that holds a low-pressure vessel
• The vessel holds a fixed volume of air surrounded by an insulated heater, controlled by an electronic temperature controller.
• A hand-operated valve at the bottom of the vessel allows
  students to normalise the air in the vessel to ambient
  conditions.
• The equipment uses normal clean dry air, as it behaves
  as an ideal gas over the range of pressures used in this
  equipment.
• A thermocouple measures the temperature of the heater
  surface for the controller
• Two thermocouples measure the temperature of the air in the vessel
• A pressure transducer measures the pressure of the heated air in the vessel.
• A digital display shows the absolute pressure, both
  temperatures and their average value
• Students set the controller for the range of temperatures
  needed during the experiment. They then record the
  changes in pressure as the temperature increases and
  plot the results to prove Gay-Lussac’s law
• The experiment can also work in reverse; students heat the
  vessel, open the valve to normalize the air in the vessel,
  then shut the valve. They then record the pressure and
  temperature drop as the vessel cools naturally.

Learning Outcomes:

• Demonstrates change of pressure of a fixed volume of
  gas during heating
• Proving Gay-Lussac’s law by experiment
• The principle of a vapour pressure thermometer