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funnel viscosity

1. n. [Drilling Fluids]

Time, in seconds for one quart of mud to flow through a Marsh funnel. This is not a true viscosity, but serves as a qualitative measure of how thick the mud sample is. The funnel viscosity is useful only for relative comparisons.

See: gel strengthMarsh funnelviscosity

Diagram of marsh funnel
Diagram of Marsh funnel.

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