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unit

Dynamic viscosity

Definition

The dynamic viscosity is the physical measure of the environment (oil, gas) internal friction coefficient of the environment (oil, gas) to cause internal friction resistance at mutual non-uniform movement of internal layers.

1 pascal second equals the dynamic viscosity of the environment, the tangential stress for which at the laminar flow and speed differences, according to the normal of 1 meter per second of the layers situated at a distance of 1 meter, it is equal to 1 pascal.

 

system of units:   SI;
statute:   derived unit;
name the value:   η;
unit name:   pascal second;
symbol unit:   Pa·s;
relationship of definition:   η = F/((dv/dl)·ΔS);
dimension:   L-1 M T-1;
expression in other units:   lbf·s/ft², lbf·s/in²;

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Units of measurement

namesymbol value in SI unit:
Pa·s
note
1 poiseP, Po= 0.1 
1 poundal second per foot square ≈ 1.488 164 
1 pound-force per foot squarelbf·s/ft²≈ 47.880 26 
1 pound-force per inch squarelbf·s/in²≈ 6 894.757 
1 pound per foot hourlb/(ft·h)≈ 4.13 378 9 × 10-4 
1 pound per foot secondlb/(ft·s)≈ 1.488 164 
1 slug per foot secondslug/(ft·s)≈ 47.880 26