(Many physical quantities are defined solely in terms of how they are measured. Temperature is operationally defined to be what we measure with a thermometer. The scientific definition of temperature is less ambiguous than your senses of hot and cold. For example, if you place one hand in hot water and the other in cold water, and then place both hands in tepid water, the tepid water will feel cool to the hand that was in hot water, and warm to the one that was in cold water. Human perception of what feels hot or cold is a relative one. The concept of temperature has evolved from the common concepts of hot and cold.
State the zeroth law of thermodynamics.
By the end of this section, you will be able to:
