Search for Science Fair Projects

1000 Science Fair Projects with Complete Instructions

Concentration Gradient

Concentration gradient is the difference in how much of something is dissolved on each side of a barrier.

Think of it this way

Salt dissolves in water on one side of a thin cloth. Plain water sits on the other side. The salt moves through the cloth from the crowded side to the empty side. It keeps moving until both sides match.

Explaining concentration gradient by grade level

Put an egg with no shell into salty water. The egg side has less salt. The water side has more salt. Water moves toward the saltier side to even things out.

Projects that explore concentration gradient

Osmosis in Eggs Without Shells

A concentration gradient means one side of a membrane has more dissolved material than the other. In this experiment, you place eggs in three liquids: distilled water, a sugar solution, and a salt solution. Each liquid contains a different amount of dissolved substance, so each creates a different gradient across the egg membrane. That difference determines what happens next — some eggs swell, and others shrink.

Medium