THERMAL CONDUCTIVITY OF INSULATING POWDER

The apparatus consists of an insulating powder, which is enclosed in acavity of two concentric spheres. The inner space of the inner sphere contains the mica heater. Input to the heater can be adjusted by the dimmerstat.The tappings on the surfaces of the inner sphere and outer sphere are used to find out the temperature difference between the spheres. This enables to find out the conductivity of powder.