Evaluating the phrases listed, the phrase which does not fit the pattern would be capacity.
- The discharge, velocity and gradient are measured which could be used to show the per unit rate of a phenomenon.
- The discharge rate, velocity rate, gradient all have the property of evaluting changes per unit of time.
- Capacity on the other hand gives the tutal measure or size of an object or material.
Hence, the phrase which does not fit in would be capacity.
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