This measures temperature.

This measures temperature.

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

Answer: (D)

Measuring temperature is the key idea. A thermometer directly gauges how hot or cold something is and provides a numerical reading on a temperature scale, making it the tool specifically built for temperature measurement. The barometer, on the other hand, measures atmospheric pressure, which relates to weather patterns but not temperature itself. The psychrometer uses two thermometers (one dry, one with a wet wick) to determine humidity through evaporative cooling, so its primary purpose is humidity, not simply temperature. The anemometer measures wind speed. So the thermometer is the best answer because it is designed to quantify temperature directly.

Measuring temperature is the key idea. A thermometer directly gauges how hot or cold something is and provides a numerical reading on a temperature scale, making it the tool specifically built for temperature measurement. The barometer, on the other hand, measures atmospheric pressure, which relates to weather patterns but not temperature itself. The psychrometer uses two thermometers (one dry, one with a wet wick) to determine humidity through evaporative cooling, so its primary purpose is humidity, not simply temperature. The anemometer measures wind speed. So the thermometer is the best answer because it is designed to quantify temperature directly.