Technical Information

    1. Conversion of units
    2. Pressure drop in a tube
    3. Examples of viscosities
    4. Conversion of viscosities

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1. Conversion of units

Conversion of pressure units
→

Conversion of volume units
→

Conversion of volume flow units
→

2. Pressure drop in a tube

The volume flow Q of a liquid with dynamic viscosity η in a tube with length L and inside diameter D causes a pressure drop Δp.

The pressure drop in laminar case is calculated as follows:

Volume flow Q:
ml/min

Dyn. viscosity η: mPas (= cP)

Length L:

Inside diameter
D: mm

Pressure drop Δp:

3. Examples of viscosities

Liquid	η [mPas]
Water, liquid, 0 °C	1,79
Water, 20 °C	1
Water, 50 °C	0,55
Water, 80 °C	0,36
Water, liquid, 100 °C	0,28

Liquid	η [mPas]
Acetone	0,36
Benzene	0,65
Ethanol	1,2
Methanol	0,58
Toluene	0,59

4. Conversion of viscosities

Dynamic viscosity 1 mPas = 1 cP (P = Poise)
Kinematic viscosity 1 mm²/s = 1 cSt (St = Stokes)

Value Dimension Calculate Formula

mm²/s Kinematic viscosity ν ν = η / ρ

g/cm³ Specific gravity ρ ρ = η / ν

mPas Dynamic viscosity η η = ρ * ν

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