Calorimeter for gases

• Hydrogen and oxygen
• Hydrogen and chlorine
• Carbon monoxide and oxygen.

The gases are forced out of two gas syringes (e.g. 665 913) and through two capillary tubes into the path of an electric arc. Continuous combustion takes place here.
The combustion gases and the excess of one of the reaction gases flow through a helical heat exchanger, where the heat of reaction is transferred to the calorimetric fluid, and thence into a third gas syringe. The amount of fluid in the heat exchanger is kept small since gas reactions using gas syringes allow only small quantities of a substance to be burned. In addition we recommend that the calorimetric liquid used be a substance of low heat capacity, e.g. trichloromethane. The temperature rise is measured with a precision thermometer (666 176) or temperature sensor (666 193) connected to the temperature measurement instrument666 190 or666 210. The unit is made entirely of glass. This gives the following advantages:

• All the processes are visible
• Heat losses are low, particularly as the unit is not in any direct contact with any metal parts (stand components).

We recommend using the spark gap power supply 667 820 to supply the arc. When using other high voltage sources please bear in mind that excess power can cause the platinum wire to melt.