Convert Pounds per foot-hour to Poise
Instantly convert Pounds per foot-hour (lb/(ft·hr)) to Poise (P) with our free online calculator.
Formula: lb/(ft·hr) to P — multiply by 0.00413379
Reference Table
| Pounds per foot-hour (lb/(ft·hr)) | Poise (P) |
|---|---|
| 1 | 0.00413379 |
| 5 | 0.0206689 |
| 10 | 0.0413379 |
| 25 | 0.103345 |
| 50 | 0.206689 |
| 100 | 0.413379 |
How to Convert Pounds per foot-hour to Poise
Formula
To convert Pounds per foot-hour (lb/(ft·hr)) to Poise (P): multiply by 0.00413379
Step-by-Step
- Start with your value in Pounds per foot-hour (lb/(ft·hr)).
- Multiply by 0.00413379 to perform the conversion.
- The result is your value expressed in Poise (P).
Conversion Factor
1 lb/(ft·hr) = 0.00413379 P
Reverse Factor
1 P = 241.909 lb/(ft·hr)
Worked Example
Convert 25 Pounds per foot-hour to Poise: 25 lb/(ft·hr) = 0.103345 P
About Pound per foot-hour (lb/(ft·hr))
An imperial dynamic-viscosity unit using pound-mass per foot-hour (≈ 4.1338 × 10⁻⁴ Pa·s = 0.4134 cP per NIST SP 811 = exactly 1/3,600 of lb/(ft·s)). Used in US process-engineering and HVAC contexts where the natural process timescale is hours rather than seconds — making the time-base of the viscosity unit match the time-base of the mass-flow or heat-flow calculation it appears in, eliminating intermediate unit conversions. Common in heat-transfer-coefficient correlations for gas-phase viscosity at industrial operating conditions (gas viscosity is ~10⁻⁵ Pa·s, which in lb/(ft·hr) becomes ~0.02 — a much more legible number than the SI version). Also appears in older US chemical-engineering handbooks (Perry's pre-2008 editions, McCabe-Smith-Harriott, Bird-Stewart-Lightfoot first edition), refining-process design references where the entire material/energy balance is in lb-h-ft-Btu units, and gas-pipeline transmission design per AGA Report No. 8 and 10 supercompressibility tables. Convert lb/(ft·hr) to Pa·s by multiplying by 4.1338 × 10⁻⁴; to cP by multiplying by 0.4134.
About Poise (P)
The CGS unit of dynamic viscosity, equal to exactly 0.1 Pa·s. Named after French physician Jean Léonard Marie Poiseuille, whose 1840s experimental and theoretical work on blood-flow in small tubes produced the Hagen-Poiseuille equation that underpins modern laminar-flow analysis. Although superseded by Pa·s in modern SI usage, the poise still appears in: older fluid-dynamics literature (pre-1980 US and European textbooks), geophysics and Earth-science publications for highly viscous fluids where the magnitude is convenient (asthenosphere ~10¹⁸ P, lower mantle ~10²² P, basaltic lava 10² to 10⁴ P at eruption temperature, rhyolitic lava 10⁹ to 10¹¹ P), glass-manufacturing process tables (the working point of glass = 10⁴ P; softening point = 10⁷·⁶ P; annealing point = 10¹³·² P; strain point = 10¹⁴·⁵ P), and some polymer-rheology / extrusion literature where melt viscosities of 10⁴ to 10⁷ P are common.
Quick Facts
- 1 Pound per foot-hour equals 0.00413379 Poise
- 1 Poise equals 241.909 Pounds per foot-hour
- Pound per foot-hour is a unit of dynamic viscosity
- Poise is a unit of dynamic viscosity
- This conversion is commonly used in lubricant selection, chemical processing, and fluid dynamics
- The Pound per foot-hour belongs to the imperial system
- The Poise belongs to the metric system
Common Pound per foot-hour to Poise Conversions
| Pounds per foot-hour (lb/(ft·hr)) | Poise (P) |
|---|---|
| 0.01 | 0.0000413379 |
| 0.1 | 0.000413379 |
| 0.25 | 0.00103345 |
| 0.5 | 0.0020669 |
| 1 | 0.00413379 |
| 2 | 0.00826758 |
| 3 | 0.0124014 |
| 5 | 0.0206689 |
| 10 | 0.0413379 |
| 15 | 0.0620068 |
| 20 | 0.0826758 |
| 25 | 0.103345 |
| 50 | 0.206689 |
| 75 | 0.310034 |
| 100 | 0.413379 |
| 250 | 1.03345 |
| 500 | 2.06689 |
| 1000 | 4.13379 |
| 5000 | 20.6689 |
| 10000 | 41.3379 |
Understanding Pounds per foot-hour
The Pound per foot-hour (symbol: lb/(ft·hr)) is a unit of dynamic viscosity. An imperial dynamic-viscosity unit using pound-mass per foot-hour (≈ 4.1338 × 10⁻⁴ Pa·s = 0.4134 cP per NIST SP 811 = exactly 1/3,600 of lb/(ft·s)). Used in US process-engineering and HVAC contexts where the natural process timescale is hours rather than seconds — making the time-base of the viscosity unit match the time-base of the mass-flow or heat-flow calculation it appears in, eliminating intermediate unit conversions. Common in heat-transfer-coefficient correlations for gas-phase viscosity at industrial operating conditions (gas viscosity is ~10⁻⁵ Pa·s, which in lb/(ft·hr) becomes ~0.02 — a much more legible number than the SI version). Also appears in older US chemical-engineering handbooks (Perry's pre-2008 editions, McCabe-Smith-Harriott, Bird-Stewart-Lightfoot first edition), refining-process design references where the entire material/energy balance is in lb-h-ft-Btu units, and gas-pipeline transmission design per AGA Report No. 8 and 10 supercompressibility tables. Convert lb/(ft·hr) to Pa·s by multiplying by 4.1338 × 10⁻⁴; to cP by multiplying by 0.4134.
It belongs to the imperial measurement system.
Pounds per foot-hour are commonly used in lubricant selection, chemical processing, and fluid dynamics.
Understanding Poise
The Poise (symbol: P) is a unit of dynamic viscosity. The CGS unit of dynamic viscosity, equal to exactly 0.1 Pa·s. Named after French physician Jean Léonard Marie Poiseuille, whose 1840s experimental and theoretical work on blood-flow in small tubes produced the Hagen-Poiseuille equation that underpins modern laminar-flow analysis. Although superseded by Pa·s in modern SI usage, the poise still appears in: older fluid-dynamics literature (pre-1980 US and European textbooks), geophysics and Earth-science publications for highly viscous fluids where the magnitude is convenient (asthenosphere ~10¹⁸ P, lower mantle ~10²² P, basaltic lava 10² to 10⁴ P at eruption temperature, rhyolitic lava 10⁹ to 10¹¹ P), glass-manufacturing process tables (the working point of glass = 10⁴ P; softening point = 10⁷·⁶ P; annealing point = 10¹³·² P; strain point = 10¹⁴·⁵ P), and some polymer-rheology / extrusion literature where melt viscosities of 10⁴ to 10⁷ P are common.
It belongs to the metric measurement system.
Poise are commonly used in lubricant selection, chemical processing, and fluid dynamics.
Why Convert Pounds per foot-hour to Poise?
Converting between Pounds per foot-hour and Poise is a frequent requirement for engineers, scientists, and students working with dynamic viscosity values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate dynamic viscosity conversion is essential.
Frequently Asked Questions
How do I convert Pounds per foot-hour to Poise?
An imperial dynamic-viscosity unit using pound-mass per foot-hour (≈ 4. To convert Pounds per foot-hour to Poise, multiply by 0.00413379. For example, 25 lb/(ft·hr) equals 0.103345 P.
How many Poise are in 1 Pound per foot-hour?
There are 0.00413379 Poise in 1 Pound per foot-hour.
How many Pounds per foot-hour are in 1 Poise?
There are 241.909 Pounds per foot-hour in 1 Poise.
What is the formula for Pound per foot-hour to Poise conversion?
The formula is: multiply by 0.00413379. This means 1 lb/(ft·hr) = 0.00413379 P.
Is a Pound per foot-hour bigger than a Poise?
Yes. One Pound per foot-hour is larger than one Poise because 1 lb/(ft·hr) equals 0.00413379 P, which is less than 1.
When do you need to convert between Pounds per foot-hour and Poise?
The CGS unit of dynamic viscosity, equal to exactly 0. Pound per foot-hour and Poise are both dynamic viscosity units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.