Temperature is measured with a thermometer usually made of a glass tube with colored alcohol. As the air gets hotter, the level of the liquid rises and, as the air gets cooler, the level falls. The temperature of the air is always changing. Air temperature is a very important part of weather measurement. It is recommended to begin by giving each group a thermometer and let each student practice reading the indoor temperature. Students should look straight at the thermometer at eye level.

How Temperature is measured with a thermometer
Thermometers are instruments used to measure temperature accurately. There are various types of thermometers, but they all work on the same basic principle. Here's how temperature is measured with a thermometer:

Types of thermometers
- Mercury thermometers: These consist of a glass tube filled with mercury that expands or contracts with temperature changes.
- Digital thermometers: These use electronic sensors to measure temperature and display the results digitally.
- Infrared thermometers: These measure temperature by detecting infrared energy emitted by an object.

Calibration
Before using a thermometer, it needs to be calibrated to ensure accurate readings. This involves comparing it against a known standard, such as the freezing and boiling points of water.

Measuring temperature
To measure temperature with a thermometer, the instrument is placed in direct contact with the object or substance whose temperature needs to be determined. The thermometer should be left in place for a sufficient amount of time to allow the temperature to stabilize and give an accurate reading.

Reading the thermometer
Once the temperature has stabilized, the reading on the thermometer can be noted. This may involve looking at the level of the mercury in a traditional thermometer, checking the digital display, or interpreting the infrared readings.

Units of temperature
Temperature can be measured in various units, such as Celsius, Fahrenheit, or Kelvin. It's important to ensure that the thermometer and the units being used are compatible to avoid errors in measurement.
In conclusion, thermometers are essential tools for measuring temperature accurately. By understanding how they work and following proper procedures, accurate temperature readings can be obtained for a wide range of applications.