Kelvin is the base unit of which pysical quantity?

Those quantities which can be measured directly or indirectly is called physical quantities.

There are two types of physical quantities.They are:

Those quantity which are not dependent upon any quantity are called fundamental quantity.for eg: length,mass time etc.

Those quantity which are dependent upon other quantities are called derived Quantity. for eg: volume,area etc.

Temperature is the degree of hotness and coldness of a body.Temperature is measured in degree,Celsius,degree Fahrenheit or Kelvin scale.Temperature is measured by using thermometer.

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Explanation: Research states that ;

Thermodynamic temperature is the measure ( absolute)  of temperature and is one of the principal parameters of thermodynamics.

It uses the kelvin scale for measurement and selects the triple point of water at 273.16 K as the fundamental fixing point.

see earlier

c. magnitude and direction