Thermometer

A thermometer is an instrument used to measure temperature. It is most commonly used to measure body heat and air temperature.

What Is It Used For?

A thermometer indicates how hot or cold something is.

-Doctors use it to measure patients’ body temperature.

-Thermometers are found in homes, schools, and weather stations.

-A person’s normal body temperature is usually between 36.5 and 37°C. If a thermometer shows a value above this range, it indicates a fever.

How Does It Work?

There are two types of thermometers:

Mercury Thermometer:

It contains a very thin glass tube filled with mercury, a silvery liquid. When the air or body temperature rises, the mercury expands and rises; when the temperature falls, the mercury contracts and drops.

Digital Thermometer:

It operates using electronic components and displays the temperature of the surface it touches as a number. Today, digital thermometers are used more frequently because they are faster and safer.

Where Is It Used?

-In hospitals: Doctors measure patients’ body temperature.

-At home: The temperature of children or adults is monitored.

-Outdoors: Air temperature is measured.

-In kitchens: The cooking temperature of certain foods is checked.

-In laboratories: Scientists track temperature changes during experiments.

History of the Thermometer

-The first concept of a thermometer was proposed in the 1600s by Galileo Galilei.

-The modern thermometer we use today was developed in 1714 by Daniel Gabriel Fahrenheit.