SA:Vol calculations

How do you work out the volume of a cuboid?

length x width x height

How do you work out the surface area of a cuboid?

(4 x length x height) + (2 x height x width)

How do you work out the area of a circle?

pi x r²

How do you work out the circumference of a circle?

2pi x r

How do you work out the volume of a cylinder?

pi x r² x height

How do you work out the surface area of cylinders?

(2pi x r x height) + 2pi x r²

How do you work out the volume of a sphere?

¾ x pi x r²

How do you work out the surface area of a sphere?

4pi x r²

How do you calculate the rate of diffusion?

(Surface area x [C1 - C2]) / thickness

C1 = concentration on supply side

C2 = concentration on demand side

To maintain a concentration gradient, which side must be larger?

The supply side (C1) must be larger than the demand side (C2)