Class 11 Botany simulations · Cell: The Unit of Life

Why cells are small: surface area to volume

Split a large cube into many smaller cubes of the same total volume and compare the surface available for exchange.

Open the simulation

What to notice

Halving the side doubles the surface area for the same total volume — small cells exchange materials faster.

Key relation

Cube of side L: SA/V = 6/L

Try this

Split the cube into 4 × 4 × 4 pieces. How does the total surface area change?

What you can change

• Side of large cube: 2 to 10 μm
• Cuts per edge: 1 to 5

More in Cell: The Unit of Life

• Cell explorer
• How big are cells?
• Fluid mosaic model of the membrane

See all Class 11 Botany simulations or every Physica simulation.