Physics Lab Equipment

LETI-10 Air Specific Heat Ratio

LETI-10 Air Specific Heat Ratio


  • High performance

  • Simple structure, stable and reliable

  • Affordable


Air specific heat ratio (adiabatic index) measurement is an important experiment in general physics at universities. Traditionally, gas specific heat ratio 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 air specific heat capacity ratio at constant volume and constant pressure

2. Observe thermodynamic process of air

3. Learn how to measure gas pressure and temperature

Main 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

Main Unit1
Pressure Sensor1
Plastic Tube for Temperature Sensor1
Connection Wire2
Rubber Air Ball1
Rubber Tube1
Glass Bottle1

  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

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