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The standard unit for measuring resistance to the passage of an electrical current.

One ohm is equal to the resistance created between two points on a conductor when a potential difference of one volt creates a current of one ampere.

An ohm is also equal to the resistance offered by a column of mercury which is 1.02mm in cross sectional area and 106.3 cm long at 0 degrees C.

Electrical resistance in a solution is often related to the electrolyte concentration in the solution.