Thermometer
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Example:
Imagine trying to decide what to wear based on the weather outside. Just as you check the sky and feel the air to gauge if a jacket is needed, a thermometer measures temperature by responding to changes in its environment. The thermometer acts like your senses, detecting how hot or cold it is, and then provides a clear readout, just as you make a decision based on your observations.

Practice Version

Thermometer: An instrument that measures temperature is a thermometer. A thermometer is a tool used to check how hot or cold something is.