The instrument used for measuring temperature is a thermometer. Temperature generally can be defined as the state or degree of heat or coldness within a substance which can be measured. The normal body temperature of a person varies depending on gender, recent activities, food and fluid consumption, time day, and in women depending on the stage of the menstrual cycle. Normal body temperature can range 98.6-degree Fahrenheit or 36.5 degree Celsius for a healthy adult.
Mercury is the material that is most commonly used in thermometers and has several advantages over other substances.
The advantages of mercury over other substances include It has a high boiling point and a low freezing points, It is opaque, thus its level can easily be read when it is inside a transparent glass tube, and It is a good conductor of heat, and so rapidly reaches the temperature of the substances under test. Basically, there are different types of thermometers they are as follows: Wall Thermometers, Bath Thermometers, Lotion Thermometers, Mouth Thermometers, Clinical Thermometers, and many more.