The constant 'R' used in the characteristic gas equation PV=RT , has a constant value for a particular gas and is called 'Characteristic gas constant' or 'specific gas constant' . Its value depend upon the temperature scale used and the properties of the gas, under consideration.
The value of R will be.
For atmospheric pressure air,
R= 287 J/kg/k
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No, the gas constant, or any constant, is constant meaning it doesn't change.
Boltzmanns constant
No
No, gas constant is having a value of 8.314Jk-1mol-1 Whereas plancks constant has a value of 6.6*10-31
In Charles' Law, the mass is held constant which means that the pressure on the gas is constant.