1. The formula for calculating the surface area of a cube is: SA = length × width × number of sides (6)

Therefore, the surface area of a cube that is 1 cm on a side is 1 cm × 1 cm × 6 sides = 6 cm2

2. The formula for calculating the volume of a cube is:

V = length × width × height

Therefore, the volume of a cube that is 1 cm on each side is 1 cm × 1 cm × 1 cm = 1 cm3

Calculate the SA/V ratio for a cube that is 2 cm and 3 cm on each side.

Cell Size Surface Area Volume SA/V Diffusion Time

1 cm 13:44 min

2 cm 54:35 min

3 cm 1 Hr 41:24 min