Which instrument measures heat flow? Spectrophotometer Thermometer Calorimeter Barometer

The correct answer is Calorimeter.<br /><br />A calorimeter is an instrument used to measure the amount of heat involved in a chemical reaction, physical change, or heat capacity of a material. It is specifically designed to measure heat flow, which is the transfer of thermal energy from one object to another.<br /><br />The other options are not correct:<br /><br />- Spectrophotometer: This is an instrument used to measure the amount of light absorbed by a sample at different wavelengths. It is not used to measure heat flow.<br /><br />- Thermometer: A thermometer is a device used to measure temperature, not heat flow. It measures the temperature of an object or substance, but does not directly measure the heat involved in a process.<br /><br />- Barometer: A barometer is an instrument used to measure atmospheric pressure, not heat flow. It measures the pressure of the air, which is related to weather conditions, but does not measure heat.<br /><br />In summary, the calorimeter is the correct instrument that measures heat flow, as it is specifically designed to quantify the amount of heat involved in various processes.