Dynamic Viscosity(Oil and Water) Conversion Calculator

Dynamic Viscosity Converter

Convert between various dynamic viscosity units

Convert from:

Poise (P) Centipoise (cP) lbf·s/ft² N·s/m² (Pa·s) Water (20°C) Water (40°C) Heavy Oil (20°C) Heavy Oil (40°C) Glycerin (20°C) Glycerin (40°C) SAE 5W (-18°C) SAE 10W (-18°C) SAE 20 (-18°C) SAE 5W (99°C) SAE 10W (99°C) SAE 20 (99°C)

Convert to:

Poise (P) Centipoise (cP) lbf·s/ft² N·s/m² (Pa·s) Water (20°C) Water (40°C) Heavy Oil (20°C) Heavy Oil (40°C) Glycerin (20°C) Glycerin (40°C) SAE 5W (-18°C) SAE 10W (-18°C) SAE 20 (-18°C) SAE 5W (99°C) SAE 10W (99°C) SAE 20 (99°C)

Enter value to convert:

Conversion Result

100

Centipoise (cP)

Recent Conversions

About Dynamic Viscosity

Dynamic viscosity (also called absolute viscosity) is a measure of a fluid's resistance to shear or flow when an external force is applied. It describes the internal friction of a moving fluid.

The SI unit for dynamic viscosity is the pascal-second (Pa·s), equivalent to N·s/m². The CGS unit is the poise (P), where 1 Pa·s = 10 P. The centipoise (cP) is commonly used (1 cP = 0.01 P = 0.001 Pa·s).

Key applications: Dynamic viscosity is crucial in lubrication engineering, polymer processing, food production, and petroleum industries for characterizing how fluids behave under stress.

1. Introduction

Dynamic viscosity (also called absolute viscosity) measures a fluid's resistance to shear or flow when an external force is applied. It is crucial in industries like lubrication, hydraulics, and fluid dynamics. A Dynamic Viscosity Conversion Calculator helps convert between different units used worldwide.

Formula for Dynamic Viscosity (μ)

$$\mu =\tau \mathrm{/}\dot{\gamma }$$

where:

• $\mu$ = Dynamic viscosity (Pa·s)

• $\tau$ = Shear stress (Pa)

• $\dot{\gamma }$ = Shear rate (s⁻¹)

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2. Common Units of Dynamic Viscosity

Different industries use different units for dynamic viscosity. The most common ones are:

Unit	Symbol	Equivalent in SI (Pa·s)
Pascal-second	Pa·s	1 Pa·s (SI unit)
Poise	P	1 P = 0.1 Pa·s
Centipoise	cP	1 cP = 0.001 Pa·s
Pound per foot-second	lb/(ft·s)	1 lb/(ft·s) ≈ 1.48816 Pa·s
Newton-second per square meter	N·s/m²	Same as Pa·s

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3. How a Dynamic Viscosity Conversion Calculator Works

The calculator allows users to:

• Input a viscosity value in one unit.

• Select the desired output unit.

• Get the converted value instantly.

Conversion Formulas

Conversion	Formula
Poise to Pa·s	${\mu }_{Pa\cdot s}={\mu }_P\times 0.1$
Centipoise to Pa·s	${\mu }_{Pa\cdot s}={\mu }_{cP}\times 0.001$
lb/(ft·s) to Pa·s	${\mu }_{Pa\cdot s}={\mu }_{lb\mathrm{/}(ft\cdot s)}\times 1.48816$
N·s/m² to Pa·s	${\mu }_{Pa\cdot s}={\mu }_{N\cdot s\mathrm{/}{m}^2}$ (same unit)

Example Calculation

Convert 500 cP to Pa·s:

$$500\text{cP}=500\times 0.001$$

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4. Dynamic Viscosity of Oil vs. Water

• Water at 20°C: ~1.002 cP (0.001002 Pa·s)

• Engine Oil (SAE 10W-30): ~65–300 cP (0.065–0.3 Pa·s)

• Honey: ~2,000–10,000 cP (2–10 Pa·s)

A good calculator may include temperature-dependent viscosity for oils and water.

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5. Applications of Dynamic Viscosity Conversion

• Oil & Lubrication Industry: Selecting the right motor oil viscosity (e.g., SAE 5W-30).

• Chemical Engineering: Designing pipelines and pumps.

• Food Industry: Measuring syrup, honey, and dairy products.

• Pharmaceuticals: Ensuring proper drug formulation viscosity.

• Aerospace & Automotive: Hydraulic fluid analysis.

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6. Features of a Good Dynamic Viscosity Calculator

• Multiple Unit Support: Converts between Pa·s, P, cP, lb/(ft·s), etc.

• Temperature Adjustments: Some oils change viscosity with temperature.

• User-Friendly Interface: Simple dropdown menus and input fields.

• Mobile & Web Compatibility: Works on smartphones and PCs.

• Additional Tools: May include kinematic viscosity and density converters.