PASCO Adiabatic Gas Law Apparatus – TD-8565

SKU: TD-8565 Categories: ,


Adiabatic and isothermal processes are difficult for beginning physics students to understand. PASCO’s Adiabatic Gas Law apparatus provides the ideal dem­on­stra­tion.

Special Features

  • Volume Transducer: A linear po­ten­tial divider is mounted on the side of the piston. A 5-Volt source from the comput­er is applied across the potentiometer element. The voltage from the com­mu­ta­tor brush on the cylinder is used to indicate the position of the piston and the volume of the confined gas.
  • Pressure Sensor: A solid-state, piezoresistive device that forms part of a bridge circuit is mounted at the base of the cylinder.
  • Temperature Sensor: Mounted in the cylinder on the top of the base. The active element is fine nickel wire with a high surface-to-mass ratio. The wire’s temperature changes rapidly as the gas compresses or expands.


  • Adiabatic Gas Law Apparatus
  • Instruction manual, experiment guide and the fully documented experiment, “Measurement of Work to Compress Gases Adiabatically” (sample data included).
  • Signal Cables 3.5 mm plug to 5-pin DIN
  • Power Adapter 9V DC @ 1A

A Versatile Lab Tool

  • Compare the final pressure and temperature: values predicted by the Adiabatic Gas Law.
  • Measure the work done on the gas: compare it to the change in internal energy and the theoretical work performed.
  • Determine gamma: the ratio of specific heats for the gas (Cp/Cv).
  • Use monatomic, diatomic and polyatomic gases: determine the effects of molecular structure on gamma.
  • Investigate isothermal com­pres­sion and expansion.


PASCO’s Adiabatic Gas Law can be used with an 850 Universal Interface or a previous generation ScienceWorkshop Interface such as the 500 or 750. The computer functions as a 3-channel storage os­cil­lo­scope, plotting graphs of pressure, temper­a­ture and volume as well as integrating the area under a pressure versus volume curve to determine the work done on the gas.