As the material in the thermistor is heated or cooled its electrical resistance changes. The CBL measures the change in resistance and converts this value into a temperature reading in Celsius. When you touch the probe to something it takes a few seconds for the probe and the object to reach a common temperature. After this happens the probe is said to be in thermal equilibrium with the object it is touching. To make accurate measurements it is important to wait until the temperature reading of the probe is fairly constant.
Objects reach thermal equilibrium by transferring heat back and fourth.
Heat always flows from a region of high temperature to a region of low temperature. They aren't the same thing. F all year round. It feels very cool because HEAT is flowing from your nearly dead body to the 70 o air in the house. In this activity you will measure temperatures around the laboratory to learn how the temperature probe works.