Calculation of physical pressure When the cubes A and B made of the same material are placed on the horizontal plane, the pressure of a and B on the desktop is P1 and P2 respectively. When a is placed on top of B, the pressure of B on the desktop is: [cube A is bigger than cube B, and its surface area is a little larger than cube b]

Calculation of physical pressure When the cubes A and B made of the same material are placed on the horizontal plane, the pressure of a and B on the desktop is P1 and P2 respectively. When a is placed on top of B, the pressure of B on the desktop is: [cube A is bigger than cube B, and its surface area is a little larger than cube b]

Suppose that the side length of a is H1, then its bottom area is S1 = the square of H1; if the side length of B is H2, then its bottom area is S2 = the square of H2
P1 = G1 / S1 = the square of G1 / H1 = the cube of ρ GH1 / the square of H1 = ρ GH1
P2 = square of G2 / h2 = ρ GH2
When a is placed on B, the pressure of B on the horizontal plane is P2 '= (G1 + G2) / square of h2 = (cube of ρ GH1 + cube of ρ GH2) / square of H2. By multiplying the numerator and denominator by the square of (ρ g), P2' = [(cube of ρ GH1) + (cube of ρ GH2)] / (square of ρ GH2) = (cube of P1 + cube of P2) / cubic of P2 is obtained