It is cheap and easy to use and no power source is required.
It can measure only limited range of temperature. The accuracy of this type of thermometer is based on the manufacturing process. The scale is calibrated properly according to the temperature variation. A scale is marked on the periphery of the thermometer to measure the temperature as liquid expands. The space in the glass tube is filled with nitrogen or partial vacuum.
The small change in the volume drives the mercury column relatively long way. The volume of the liquid changes with change in the temperature. Thermal expansion of liquid takes place into the thermometer. The liquid is chosen in such a way that it expands quickly as per slight change in temperature. But due to some hazardous effect of mercury, other fluids for example organic liquid or some alcohol which are less toxic replaced mercury. The most commonly used liquid is mercury. As name suggests this device consists of a small diameter glass tube containing some liquid. We all are aware of it and use it many times for measuring our body temperature in case of fever. It is the most common type of temperature measuring device. Following are the most commonly used temperature measuring devices. Almost all the methods depend upon the measuring some physical property of a working material that varies with temperature. Till now many methods have been developed for measuring temperature. For measuring temperature we use different methods and devices. We can easily convert one unit of temperature into another by using some calculations. Kelvin (k) is the international system of units (SI) of temperature, other than Kelvin temperature is measured in Celsius scale (C) and Fahrenheit scale (F). We can calibrate temperature in different scales and in different units according to our requirements. Temperature is a physical quantity which is defined as the hotness or coldness of any object or substance.
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