Some authors prefer to use force as a primary dimension in place of mass. In a typical fluid mechanics problem, then, the four represented primary dimensions m, L, t, and T are replaced by F, L, t, and T. The primary dimension of force in this system is {force} = {F}. Using the results of Prob. 7–3, rewrite the primary dimensions of the universal gas constant in this alternate system of primary dimensions.

Data from problem 3

Write the primary dimensions of the universal ideal gas constant R_u. (Use the ideal gas law, PV = nR_uT where P is pressure, V is volume, T is absolute temperature, and n is the number of moles of the gas.)