An evaporimeter is an instrument used to measure the rate of evaporation of water or other liquids. Synonyms for evaporimeter include evaporator, evaporimeter gauge, evaporograph, and evaporometry apparatus. The evaporator is a device that uses heat to convert liquid into vapor, while the evaporimeter gauge measures the amount of liquid that is evaporated. The evaporograph is an instrument that records the changes in humidity and temperature that occur during the evaporation process. The evaporometry apparatus is a system used to measure the water vapor pressure in the air. These synonyms are often used interchangeably, but they all serve the same purpose of measuring the rate of evaporation.