What instrument is used to measure temperature?

• A. Barometer
• B. Thermometer
• C. Hygrometer
• D. Seismometer

Answer: (B)

The thermometer is the instrument specifically designed to measure temperature. It functions by using materials that expand or contract in response to temperature changes, allowing it to provide a reading of how hot or cold an environment is. Different types of thermometers operate on various principles, such as the expansion of liquids like mercury or alcohol, or digital sensors that provide electronic readings.

In contrast, a barometer is used to measure atmospheric pressure, which can help predict weather changes. A hygrometer measures humidity, or the amount of moisture in the air. A seismometer detects and records the motion of the ground, primarily used for studying earthquakes. Each of these instruments serves distinct purposes tailored to specific scientific measurements, underscoring why the thermometer is vital for measuring temperature.