Temperature and it's measurement




Temperature
is the degree of coldness and hotness of a body.
It's S.i unit is Kelvin [K].
-Temperature is the property of a body which determines the part of heat flow.
-It is measured with the aid of a thermometer.

Types Of Thermometer

* Gas thermometer
* Liquid in glass thermometer
* Resistance thermometer
* Thermoelectric thermometer etc.

Gas thermometer 

Consist of a Gas which expands as temperature increases and contract as temperature decreases in obedience to the gas law. Hence,it thermometric property is a ∆in volume with a change in temperature.

Liquid in Glass Thermometer

Consist of liquid whose thermometric property is a ∆ in volume with ∆ in temperature
The common thermometric used are Mercury and Alcohol

Water isn't part of the liquid because :-

1) It has high melting point

2) It is colourless ; hence cannot be easily seen in glass

3)It wet glass


Resistance thermometer

The thermometric property of the resistance thermometer is the variation of electrical resistance of a wire (e.g platinum) with a ∆ temperature.


Thermoelectric thermometer

They are used in measuring very high temperature in industries.
They work under the principle of thermoelectric.

Difference between heat and temperature

Heat is the measurement of the total internal energy of the body while Temperature is the measurement of the average kinetic energy of the body


Heat is a form of energy called thermal while Temperature is the degree of hotness or coldness of the body

Heat is measured in joules
Temperature is measured directly using a Thermometer measured in Kelvin Celsius or Fareinheit

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