Potassium is said to be at equilibrium during a resting potential because

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During the resting potential of a neuron, potassium ions (K+) are at equilibrium because the electrostatic pressure (the force due to charge differences across the membrane) that pulls potassium ions into the cell is balanced by the diffusion pressure (the force due to concentration gradients) that pushes potassium ions out of the cell. This balance allows the cell to maintain its resting potential.

Potassium Is Said to Be at Equilibrium During a Resting