SI unit of Temperature | What is the SI unit of Temperature
- Celsius
Heat is the most important form of energy which is used by all of us in abundant form. The sensation of hotness or coldness is nothing the heat energy or thermal energy. To measure quantity of heat we describe the concept of temperature. Temperature gives the actual amount of heat present in the substance. On the basis of temperature one can explain the flow or transfer of heat.
Temperature is measured in different scales such as oC, oF, oK
To finalize the scale for measurement of temperature of substance, water is taken as reference material.
Sir Anders Celsius has performed experiment with mercury column in glass capillary is kept in water at one atmosphere in freezing state is marked as zero (0). Then the water is heated till it gets boiled and the corresponding point i.e. boiling of water is marked as hundred (100).
The total length of mercury column is then divided in two hundred equal parts. Each part is taken as one degree centigrade.
In the honour of Sir Anders Celsius, the degree centigrade is named as degree Celsius 0C.
Thus the SI unit of temperature is degree Celsius 0C.
Faq on SI unit of Temperature
Q.1) Which materials are preferred to make laboratory thermometer?
Answer: Laboratory thermometers are mostly made up of mercury and ethanol. Mercury is the metal present in liquid state. When the temperature of mercury is increases it starts expanding. Mercury column in thin glass tube is keeps on expanding till the level of temperate becomes same as that of substance in contact. In similar way, ethanol (ethyl alcohol) also can be used to make thermometer of higher scale range.
Q.2) Which thermometers are used for measurement of temperature higher range?
Answer: Thermometers with mercury or ethyl alcohol are not feasible to measure higher temperature as there is restriction on size column. In such case thermometers made with semiconducting materials are preferred.