A thermometer is a device that measures temperature or a temperature gradient. A thermometer has two important elements: a temperature sensor in which some change occurs with a change in temperature; and some means of converting this change into a numerical value.

What is a simple definition of a thermometer?

: an instrument for determining temperature specifically : one consisting of a sensor housed in a metal probe that registers a change in electrical resistance as a change in temperature.

What is thermometer explain?

A thermometer is a device used for measuring temperature. ... A thermometer is an instrument that measures temperature. It can measure the temperature of a solid such as food, a liquid such as water, or a gas such as air. The three most common units of measurement for temperature are Celsius, Fahrenheit, and kelvin.