👉 In thermodynamics and engineering, a calorimeter is a device used for measuring temperature. It consists of a thermometer that measures the change in temperature as it moves through a fluid or material. The heat transferred to or from the fluid or material by the thermometer is proportional to the difference between the initial and final temperatures. The term "calorimeters" comes from the Greek word "calor", which means "heat". A calorimeter is an instrument used for measuring the amount of heat that has been