Principle

Heat is added to a gas in a glass vessel by an electric heater which is switched on briefly. The temperature increase results in a pressure increase, which is measured with a manometer. Under isobaric conditions a temperature increase results in a volume dilatation, which can be read from a gas syringe. The molar heat capacities are calculated from the pressure or volume change.

Benefits

• Determination of cp and cv
• For both demonstration and student experiments
• Suitable for many different gases
• Simplified implementation: all pre-settings already prepared

Tasks

Determine the molar heat capacities of air at constant volume and at constant pressure.

Learning objectives

•  Equation of state for ideal gases
•  1st law of thermodynamics
•  Universal gas constant
•  Degree of freedom
•  Mole volumes
•  Isobars
•  Isotherms
•  Isochors and adiabatic changes of state
  

Software included. Computer not provided.