Find the dimension of Buoyancy?

What is the dimension of buoyancy?

Find the dimension of the constant b in the van der Waals equation (p+a/V^2)(V-b)=RT .

Find the dimensions of a rectangle whose perimeter is 28 meters and whose area is 40 square meters.

Find the dimension of the constant a in the van der Waals equation (p+a/V^2)(V-b)=RT .

Considering force (F) length (L) and time (T) to be fundamental physical quantities find the dimension of mass.