Which instrument is used to measure temperature?

The instrument used to measure temperature is the thermometer. Thermometers are designed specifically for capturing and displaying temperature readings, utilizing various methods such as liquid expansion (with mercury or alcohol) or electronic sensors. This makes them essential tools in various fields, including meteorology, medicine, and cooking, where precise temperature measurements are critical.

The barometer, while important for measuring atmospheric pressure, does not provide temperature information. An anemometer is used to measure wind speed, and a hydrometer is designed to measure the specific gravity or density of liquids. Each of these instruments serves distinct purposes that do not relate to measuring temperature, thereby highlighting the unique function of the thermometer in temperature measurement.