### Overview

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

#### 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.

#### Experiments

PASCO's Adiabatic Gas Law can be used with the ScienceWorkshop Interface. 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.

#### 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.

### Includes

• 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

##### Recommended

Gases: argon (monatomic), air or nitrogen (diatomic), carbon dioxide (triatomic).

##### Required - One of the following

Of current PASCO interfaces only the 850 Universal Interface has the 3 required analog ports.

However, a 550 Universal Interface could be used plugging into the two analog ports with an analog adapter (PS-2158) in one of the PASPORT ports to give three analog ports.

The discontinued ScienceWorkshop 500 and 750 interfaces can also be used.

### Interface Required

This product requires an 850 Universal Interface for use.

Have specific questions or need more information about the 850? Contact Teacher and Technical Support.  We're here to help!

### Software Required

This product requires or recommends PASCO Capstone for data collection and analysis.

TD-8565
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TD-8565