Physics Lab Equipment

LETI-10 Specific Heat Ratio of Air

LETI-10 Specific Heat Ratio of Air


  • High performance

  • Simple structure, stable and reliable

  • Affordable


The specific heat ratio (adiabatic index) of air measurement is an important experiment in general physics at universities. Traditionally, the specific heat ratio of gas is measured by using an open u-shaped mercury or water manometer for gas pressure measurement, and a mercury thermometer for temperature measurement.


This apparatus uses a diffused Silicon pressure sensor to measure gas pressure and an integrated temperature sensor to measure temperature, leading to higher accuracy and sensitivity. It has obvious thermodynamic phenomenon. Experimental error is less than 3% as compared to the standard value. Using this apparatus, students can learn the principle and applications of an advanced Silicon pressure sensor.


Using this apparatus, the following experiments can be performed:


1. Measure the specific heat capacity ratio of air at constant volume and constant pressure

2. Observe thermodynamic process of air

3. Learn how to measure gas pressure and temperature

The instruction manual contains experimental configurations, principles, step-by-step instructions, and examples of experiment results. Please click Experiment Theory and Contents to find more information about this apparatus.

Key Specifications

Digital voltmeter3-1/2 digits: pressure measurement; 4-1/2 digits: temperature measurement
Pressure sensordiffused Silicon; range: 0-10 kPa; sensitivity: 20 mV/kPa
Temperature sensorsensitivity: 1 µA/℃

Part List

Electric Unit1
Rubber Inflation Ball with Tube1
Glass Bottle with Sensors & Wires1
Multifunction Barometer/Thermometer1

  LETI-10 Air Specific Heat Ratio.png

1. Inlet Valve

2. Outlet Valve

3. Sealant

4. Pressure Sensor

5. Temperature Sensor

Schematic of system

 LETI-10 Air Specific Heat Ratio.png

Experimental process

(Click figure to enlarge)

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