SI unit of Absolute Temperature | What is the SI unit of Absolute Temperature
- Kelvin
Hello students, we are well familiar about the unit of temperature which is used in laboratories and in medical field. Celsius and Fahrenheit are the most commonly used temperature scales.
We know that, at all temperatures the atoms of given substance vibrates with certain kinetic energy. The kinetic energy of vibration of atom increases with increase in temperature and decreases with decrease in temperature.
Every substance has non zero value of kinetic energy at room temperature. When the substance is cooled the interatomic vibrations decreases and the kinetic energy of particles decreases.
Sir William Thomson (later Lord Kelvin), Mathematician and physicist from Scots-Irish did important work in electricity and explanation of first law of thermodynamics. He studied the kinetic energies of gas molecules at lowest possible temperature and found that the gases attains the zero value of kinetic energy at the temperature – 273.5 0C.
This is termed as absolute temperature.
In the honour of Sir Lord Kelvin, SI unit of absolute temperature is renamed as kelvin.
Hence, SI unit of absolute temperature is Kelvin. It’s symbol is ‘K’.
The relation between Celsius scale and Kelvin scale is
– 273.5 0C = 0 0K
Important Faq
Q.1) What is the formula to convert Celsius scale and Kelvin scale?
Answer:
– 273.5 0C = 0 0K
i.e. if the temperature is 100 0C, then in kelvin it is
(100+273) 0K = 373 0K
Q.2) What is relation between degree Celsius and Fahrenheit scale?
Answer: The relation between the degree Celsius and Fahrenheit
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