The given statement "To use the gas law constant R=0.0821 the unit for temperature should be kelvin and the unit for pressure should be atmospheres" is true.
The ideal gas law tells us about behavior of ideal gas through a equation and postulates.The ideal gas law is considered as ideal gas equation.
The ideal gas equation is given as.
PV = nRT
The value of R depends upon units of temperature, pressure and volume.
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