Understanding millipascal-seconds to poises Conversion
A millipascal-second (mPa-s) is one-thousandth of an SI pascal-second, while the poise (P) is the CGS unit of dynamic viscosity, defined as one gram per centimetre per second and equal to 0.1 pascal-second. As a result one poise contains one hundred millipascal-seconds, so converting mPa-s to poises multiplies by 0.01. The poise, named after Jean Poiseuille, still appears in rheology and petroleum work, so this conversion links familiar mPa-s figures to that traditional scale.
Conversion Formula
To convert millipascal-seconds to poises, multiply by this factor:
Step-by-Step Example
Convert 25 millipascal-seconds to poises.
How to Convert millipascal-seconds to poises
Converting mPa-s to poises means multiplying by 0.01.
- Note the viscosity: Take your value in mPa-s, for example 25 mPa-s.
- Apply the factor: Multiply by 0.01, since 1 mPa-s = 0.01 P (100 mPa-s make one poise).
- Compute: 25 × 0.01 gives the result in poise.
- Result: 25 mPa-s equals 0.25 P.
millipascal-seconds to poises conversion table
| millipascal-seconds (mPa-s) | poises (P) |
|---|---|
| 0 | 0 |
| 1 | 0.01 |
| 2 | 0.02 |
| 3 | 0.03 |
| 4 | 0.04 |
| 5 | 0.05 |
| 6 | 0.06 |
| 7 | 0.07 |
| 8 | 0.08 |
| 9 | 0.09 |
| 10 | 0.1 |
| 15 | 0.15 |
| 20 | 0.2 |
| 25 | 0.25 |
| 30 | 0.3 |
| 40 | 0.4 |
| 50 | 0.5 |
| 60 | 0.6 |
| 70 | 0.7 |
| 80 | 0.8 |
| 90 | 0.9 |
| 100 | 1 |
| 150 | 1.5 |
| 200 | 2 |
| 250 | 2.5 |
| 300 | 3 |
| 400 | 4 |
| 500 | 5 |
| 600 | 6 |
| 700 | 7 |
| 800 | 8 |
| 900 | 9 |
| 1000 | 10 |
| 2000 | 20 |
| 3000 | 30 |
| 4000 | 40 |
| 5000 | 50 |
| 10000 | 100 |
| 25000 | 250 |
| 50000 | 500 |
| 100000 | 1000 |
| 250000 | 2500 |
| 500000 | 5000 |
| 1000000 | 10000 |
What is the Millipascal-Second?
The millipascal-second is a submultiple of the SI unit of dynamic viscosity, equal to one thousandth of a pascal-second. It is the everyday unit for the viscosity of liquids such as water, oils, and beverages.
Definition
One millipascal-second is one thousandth of a pascal-second, the SI derived unit of dynamic viscosity.
In SI base units this is 10⁻³ kg·m⁻¹·s⁻¹. The millipascal-second is numerically identical to the centipoise (cP), the widely used CGS-based unit, so 1 mPa·s = 1 cP exactly.
Origin and History
The unit follows from the SI prefix "milli-" applied to the pascal-second, which itself was defined when the International System of Units systematized viscosity in terms of the pascal. Its convenience comes from matching the pre-existing centipoise, letting historical viscosity data carry over unchanged.
Law and Notable Facts
As an SI-sanctioned submultiple, the millipascal-second is fully standard. Its enduring popularity rests on a near-coincidence: liquid water at 20 °C has a dynamic viscosity of about 1.002 mPa·s, making the unit an intuitive reference point.
Real-World Examples and Conversions
- Water at 20 °C: about 1.0 mPa·s.
- Whole milk: roughly 2 to 3 mPa·s.
- Light motor oil (SAE 10 at operating temperature): tens of mPa·s.
- 1 mPa·s equals exactly 1 centipoise and 0.001 Pa·s.
What is the Poise?
The poise is the unit of dynamic viscosity in the centimetre-gram-second (CGS) system, measuring a fluid's resistance to shear flow. It remains common in fields such as chemistry, food science, and petroleum engineering.
Definition
One poise is the viscosity of a fluid in which a shear stress of one dyne per square centimetre produces a velocity gradient of one reciprocal second.
In SI terms, 1 poise = 0.1 Pa·s = 1 g·cm⁻¹·s⁻¹. The everyday subunit is the centipoise (cP), equal to 0.01 poise and to 1 millipascal-second, which is why water's viscosity is famously about 1 cP.
Origin and History
The poise is named after the French physician and physiologist Jean Léonard Marie Poiseuille (1797–1869), who studied the flow of liquids through narrow tubes, work later formalized as the Hagen–Poiseuille law. The unit was adopted within the CGS system in his honour.
Law and Notable Facts
The poise is not an SI unit, but it is accepted for continued use alongside SI in many industries. Its centipoise subunit is so entrenched that viscosity tables and specifications worldwide still quote values in cP even where the pascal-second is the formal standard.
Real-World Examples and Conversions
- Water at 20 °C: about 0.01 poise (1 centipoise).
- Air at room temperature: about 0.00018 poise.
- Glycerol at 20 °C: roughly 15 poise.
- 1 poise equals 0.1 Pa·s and 100 centipoise.
Frequently Asked Questions
How many poises are in a millipascal-second?
One millipascal-second equals 0.01 poise, because a poise is 0.1 Pa-s and therefore holds 100 mPa-s.
How does the poise relate to the centipoise?
A poise is 100 centipoises, and since 1 mPa-s equals 1 cP, it also equals 0.01 poise.
What is water's viscosity in poise?
Water near 20 degrees Celsius is about 1 mPa-s, or roughly 0.01 poise, sometimes written as 1 centipoise.
Where is the poise still used?
Rheology, petroleum engineering, and some polymer and food-science applications retain the poise and centipoise, so converting mPa-s keeps SI data compatible with those fields.
What is 250 mPa-s in poise?
Multiply 250 by 0.01 to get 2.5 poise.
People also convert
Complete millipascal-seconds conversion table
| Unit | Result |
|---|---|
| pascal-seconds (Pa-s) | 0.001 Pa-s |
| poises (P) | 0.01 P |
| centipoises (cP) | 1 cP |
| pound-force-seconds per square foot (lbf-s/ft2) | 0.00002088543 lbf-s/ft2 |
| pounds per foot-second (lb/(ft-s)) | 0.000671969 lb/(ft-s) |