Which term is used to indicate the tracking of temperature with two thermometers?

The term used for tracking temperature with two thermometers is "psychrometer." A psychrometer consists of two thermometers: one that measures the ambient air temperature (the dry-bulb thermometer) and another that measures the temperature of air at the point of evaporation (the wet-bulb thermometer). By comparing the readings from these two thermometers, one can determine the relative humidity of the air.

This method is commonly used in meteorology and HVAC applications because it provides a reliable means of assessing humidity levels based on temperature variations. The difference between the temperatures recorded by the two thermometers allows for calculations that reveal important information about moisture content in the air.

In contrast, a hydrometer is used for measuring the specific gravity of liquids, a thermocouple is a device for measuring temperature that uses the voltage generated at the junction of two different metals, and a thermometer is a general term for any device that measures temperature without the dual functionality characteristic of a psychrometer.