Thermometer

temperature · science tools · everyday tech

Two key parts. A thermometer has a sensor that changes when it gets hotter or colder, plus a way to turn that change into a number you can read.

Helps doctors. Thermometers are used in medicine to check if someone has a fever, and in hospitals to keep an eye on patients.

Watches the weather. Weather scientists called meteorologists use thermometers to track how warm or cold the air is.

Keeps machines safe. Factories and technology use thermometers to monitor processes and make sure things don't get too hot or too cold.