Arun
Last Activity: 5 Years ago
Vander Waal's Universal equation for a non ideal gas :
( P + a/v² ) * (V - b) = n R T
with the symbols having the given meanings.
P = pressure. V = volume. R = Universal Gas constant. T = absolute temperature. n = number of moles of the gas.
Since P has dimensions of Force/Area, a/V² also will have the same units and dimensions.
P = [ M ] [ L⁻¹ ] [ T⁻² ] = a / V² = a [ L³ ]⁻²
So constant a = [ M ] [ L⁵ ] [ T⁻² ]
Since b has same units and dimensions as that of V,
b = [ L³ ]
Hope it helps
