Understanding poises to millipascal-seconds Conversion
The poise (P) is the CGS dynamic-viscosity unit equal to one gram per centimeter-second. The millipascal-second (mPa·s) is the SI submultiple of the pascal-second and, conveniently, equals exactly one centipoise. This conversion lets you translate legacy poise readings into SI-based millipascal-seconds, the unit found on modern coating, ink, and polymer datasheets.
Conversion Formula
To convert poises to millipascal-seconds, multiply by this factor:
Step-by-Step Example
Convert 25 poises to millipascal-seconds.
How to Convert poises to millipascal-seconds
Convert a CGS poise reading into SI millipascal-seconds quickly.
- Note the poise figure: Record the dynamic viscosity in poise.
- Multiply by 100: One poise equals 100 millipascal-seconds.
- State the SI value: The result is the viscosity in mPa·s.
- Worked result: 25 P × 100 = 2500 mPa·s.
poises to millipascal-seconds conversion table
| poises (P) | millipascal-seconds (mPa-s) |
|---|---|
| 0 | 0 |
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
| 4 | 400 |
| 5 | 500 |
| 6 | 600 |
| 7 | 700 |
| 8 | 800 |
| 9 | 900 |
| 10 | 1000 |
| 15 | 1500 |
| 20 | 2000 |
| 25 | 2500 |
| 30 | 3000 |
| 40 | 4000 |
| 50 | 5000 |
| 60 | 6000 |
| 70 | 7000 |
| 80 | 8000 |
| 90 | 9000 |
| 100 | 10000 |
| 150 | 15000 |
| 200 | 20000 |
| 250 | 25000 |
| 300 | 30000 |
| 400 | 40000 |
| 500 | 50000 |
| 600 | 60000 |
| 700 | 70000 |
| 800 | 80000 |
| 900 | 90000 |
| 1000 | 100000 |
| 2000 | 200000 |
| 3000 | 300000 |
| 4000 | 400000 |
| 5000 | 500000 |
| 10000 | 1000000 |
| 25000 | 2500000 |
| 50000 | 5000000 |
| 100000 | 10000000 |
| 250000 | 25000000 |
| 500000 | 50000000 |
| 1000000 | 100000000 |
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.
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.
Frequently Asked Questions
How many millipascal-seconds equal one poise?
One poise equals 100 millipascal-seconds.
Is a millipascal-second the same as a centipoise?
Yes, 1 mPa·s is identical to 1 cP, so a poise is 100 of either unit.
Where are millipascal-seconds commonly used?
They are the SI-consistent viscosity unit on datasheets for paints, adhesives, inks, and molten polymers.
What is 0.5 poise in millipascal-seconds?
0.5 P equals 50 mPa·s (0.5 × 100).
How does this relate to pascal-seconds?
Since 1 Pa·s is 1000 mPa·s, one poise (100 mPa·s) equals 0.1 Pa·s.
People also convert
Complete poises conversion table
| Unit | Result |
|---|---|
| pascal-seconds (Pa-s) | 0.1 Pa-s |
| millipascal-seconds (mPa-s) | 100 mPa-s |
| centipoises (cP) | 100 cP |
| pound-force-seconds per square foot (lbf-s/ft2) | 0.002088543 lbf-s/ft2 |
| pounds per foot-second (lb/(ft-s)) | 0.0671969 lb/(ft-s) |