What exists across a cell membrane if equilibrium is not reached?

If equilibrium is not reached across a cell membrane, a concentration gradient exists, meaning there is a difference in the concentration of substances (such as ions or molecules) on either side of the membrane. This gradient can drive the movement of substances via passive transport (like diffusion) or may require active transport mechanisms to maintain or restore balance. Additionally, if there is an imbalance in charge or concentration, it can affect the cell's electrical potential and overall function.