What instrument is used to measure temperature?

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

Answer: (A)

Measuring temperature relies on a device that converts how hot or cold something is into a numeric reading. A thermometer does this by using a material that expands (or a sensor that changes) with temperature, and the scale shows the temperature in units like Celsius or Fahrenheit. As temperature rises, the liquid column climbs (in a liquid-in-glass thermometer) or the sensor reports a higher value, giving an exact measure of warmth or coldness. The other instruments measure different properties: a barometer tracks atmospheric pressure, a hygrometer gauges humidity, and an anemometer measures wind speed.