Gay-Lussacs Law

•  The bench-mounting equipment includes a back plate that holds a low-pressure vessel.  
•  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.
•  The vessel holds a fixed volume of air surrounded by an insulated heater, controlled by an electronic temperature controller.   
•  They then record the changes in pressure as the temperature increases and plot the results to prove Gay-Lussac’s Law.
•  A hand-operated valve at the bottom of the vessel allows students to normalize 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.

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