Convert Pounds per foot-hour to Pascal-seconds
Instantly convert Pounds per foot-hour (lb/(ft·hr)) to Pascal-seconds (Pa·s) with our free online calculator.
Formula: lb/(ft·hr) to Pa·s — multiply by 4.1338e-4
Reference Table
| Pounds per foot-hour (lb/(ft·hr)) | Pascal-seconds (Pa·s) |
|---|---|
| 1 | 0.000413379 |
| 5 | 0.0020669 |
| 10 | 0.00413379 |
| 25 | 0.0103345 |
| 50 | 0.020669 |
| 100 | 0.0413379 |
How to Convert Pounds per foot-hour to Pascal-seconds
Formula
To convert Pounds per foot-hour (lb/(ft·hr)) to Pascal-seconds (Pa·s): multiply by 4.1338e-4
Step-by-Step
- Start with your value in Pounds per foot-hour (lb/(ft·hr)).
- Multiply by 4.1338e-4 to perform the conversion.
- The result is your value expressed in Pascal-seconds (Pa·s).
Conversion Factor
1 lb/(ft·hr) = 0.000413379 Pa·s
Reverse Factor
1 Pa·s = 2419.09 lb/(ft·hr)
Worked Example
Convert 25 Pounds per foot-hour to Pascal-seconds: 25 lb/(ft·hr) = 0.0103345 Pa·s
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 Pascal-second (Pa·s)
The SI unit of dynamic (absolute) viscosity (ISO 80000-4 §4-32) — the ratio of shear stress to velocity gradient in a flowing Newtonian fluid (τ = μ · du/dy). Pa·s is the universal reference unit in fluid mechanics research, CFD solver inputs (Ansys Fluent, OpenFOAM, COMSOL all use Pa·s internally), rheology and tribology research, lubricant film calculations, and polymer melt-flow analysis. Reference values: water at 20 °C is 1.002 × 10⁻³ Pa·s (the calibration baseline), air at 20 °C is 1.81 × 10⁻⁵ Pa·s (~55× less viscous than water), SAE 30 engine oil at 40 °C ≈ 0.1 Pa·s, honey at room temperature ~10 Pa·s, peanut butter ~250 Pa·s, the asthenosphere of Earth's mantle ~10¹⁹ Pa·s. Glass at its working temperature (~1,400 °C) is ~100 Pa·s; at its glass-transition temperature ~10¹² Pa·s — the conventional definition of Tg. Convert Pa·s to cP (centipoise) by multiplying by 1,000; to lb/(ft·s) by dividing by 1.488.
Quick Facts
- 1 Pound per foot-hour equals 0.000413379 Pascal-seconds
- 1 Pascal-second equals 2419.09 Pounds per foot-hour
- Pound per foot-hour is a unit of dynamic viscosity
- Pascal-second 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 Pascal-second belongs to the metric system
Common Pound per foot-hour to Pascal-second Conversions
| Pounds per foot-hour (lb/(ft·hr)) | Pascal-seconds (Pa·s) |
|---|---|
| 0.01 | 0.00000413379 |
| 0.1 | 0.0000413379 |
| 0.25 | 0.000103345 |
| 0.5 | 0.00020669 |
| 1 | 0.000413379 |
| 2 | 0.000826758 |
| 3 | 0.00124014 |
| 5 | 0.0020669 |
| 10 | 0.00413379 |
| 15 | 0.00620069 |
| 20 | 0.00826758 |
| 25 | 0.0103345 |
| 50 | 0.020669 |
| 75 | 0.0310034 |
| 100 | 0.0413379 |
| 250 | 0.103345 |
| 500 | 0.206689 |
| 1000 | 0.413379 |
| 5000 | 2.0669 |
| 10000 | 4.13379 |
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 Pascal-seconds
The Pascal-second (symbol: Pa·s) is a unit of dynamic viscosity. The SI unit of dynamic (absolute) viscosity (ISO 80000-4 §4-32) — the ratio of shear stress to velocity gradient in a flowing Newtonian fluid (τ = μ · du/dy). Pa·s is the universal reference unit in fluid mechanics research, CFD solver inputs (Ansys Fluent, OpenFOAM, COMSOL all use Pa·s internally), rheology and tribology research, lubricant film calculations, and polymer melt-flow analysis. Reference values: water at 20 °C is 1.002 × 10⁻³ Pa·s (the calibration baseline), air at 20 °C is 1.81 × 10⁻⁵ Pa·s (~55× less viscous than water), SAE 30 engine oil at 40 °C ≈ 0.1 Pa·s, honey at room temperature ~10 Pa·s, peanut butter ~250 Pa·s, the asthenosphere of Earth's mantle ~10¹⁹ Pa·s. Glass at its working temperature (~1,400 °C) is ~100 Pa·s; at its glass-transition temperature ~10¹² Pa·s — the conventional definition of Tg. Convert Pa·s to cP (centipoise) by multiplying by 1,000; to lb/(ft·s) by dividing by 1.488.
It belongs to the metric measurement system.
Pascal-seconds are commonly used in lubricant selection, chemical processing, and fluid dynamics.
Why Convert Pounds per foot-hour to Pascal-seconds?
Converting between Pounds per foot-hour and Pascal-seconds 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 Pascal-seconds?
An imperial dynamic-viscosity unit using pound-mass per foot-hour (≈ 4. To convert Pounds per foot-hour to Pascal-seconds, multiply by 4.1338e-4. For example, 25 lb/(ft·hr) equals 0.0103345 Pa·s.
How many Pascal-seconds are in 1 Pound per foot-hour?
There are 0.000413379 Pascal-seconds in 1 Pound per foot-hour.
How many Pounds per foot-hour are in 1 Pascal-second?
There are 2419.09 Pounds per foot-hour in 1 Pascal-second.
What is the formula for Pound per foot-hour to Pascal-second conversion?
The formula is: multiply by 4.1338e-4. This means 1 lb/(ft·hr) = 0.000413379 Pa·s.
Is a Pound per foot-hour bigger than a Pascal-second?
Yes. One Pound per foot-hour is larger than one Pascal-second because 1 lb/(ft·hr) equals 0.000413379 Pa·s, which is less than 1.
When do you need to convert between Pounds per foot-hour and Pascal-seconds?
The SI unit of dynamic (absolute) viscosity (ISO 80000-4 §4-32) — the ratio of shear stress to velocity gradient in a flowing Newtonian fluid (τ = μ · du/dy). Pound per foot-hour and Pascal-second 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.