| | Viscosity |
 | | Viscosity is the force needed to apply on a plate of unit surface in direction of travel to move it to achieve a unitary speed variation for each unit thickness. |
 | | Viscosity is the force needed to apply on a plate of unit surface in direction to travel to move it to achieve a unit of speed gradient. |
 | | Viscosity is the power needed to apply on a plate of unit area to sustain a unit speed with a unit speed gradient. |
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