Question

what is the value of gas constant in SI unit​

Answer 1

si unit is inter national unit

Answer 2

Ideal Gas Law

This law combines the relationships between p, V, T and mass, and gives a number to the

constant! The ideal gas law is: pV = nRT, where n is the number of moles, and R is universal

gas constant. The value of R depends on the units involved, but is usually stated with S.I. units

as: R = 8.314 J/mol·K.

For air, one mole is 28.97 g (=0.02897 kg), so we can do a unit conversion from moles to

kilograms.

=

8.314

∙ × 1

0.02897 = 287

∙

This means that for air, you can use the value

R = 287 J/kg·K.

If you use this value of R, then technically the formula should be written as

pV = mRT,

where m represents the mass of air in kg (and we avoid having to do any calculations with moles.)