Liquid-in-glass thermometers, bimetal thermometers, resistance thermometers, infrared thermometers, gas thermometers and liquid-crystal thermometers are a few examples of types of thermometers. Various types of thermometers exist for multiple purposes and uses.
The basic use for a thermometer is to measure changes in temperature. The liquid-in-gas thermometer is the most commonly seen and used tool for measuring a rise or drop in temperature. These measurements are recorded in units of Celsius and Fahrenheit. Liquid thermometers usually contain mercury or alcohol that has been dyed red. Thermometers can be used to detect temperature fluctuations in clinical situations, the environment or in ovens for cooking purposes.