Fluids converters
Mass Flux Density Converter
Convert mass flux density: mass flowing through a unit area each second.
Result
737.338 lb/(ft²·h)
1 kg/(m²·s) = 737.338 lb/(ft²·h)
All units for this value
| Unit | Symbol | Value |
|---|---|---|
| Kilogram/square meter/second | kg/(m²·s) | 1 |
| Kilogram/square meter/minute | kg/(m²·min) | 60 |
| Kilogram/square meter/hour | kg/(m²·h) | 3600 |
| Kilogram/square meter/day | kg/(m²·day) | 86400 |
| Gram/square meter/second | g/(m²·s) | 1000 |
| Gram/square meter/hour | g/(m²·h) | 3600000 |
| Gram/square centimeter/second | g/(cm²·s) | 0.1 |
| Kilogram/square centimeter/second | kg/(cm²·s) | 0.0001 |
| Pound/square foot/second | lb/(ft²·s) | 0.204816 |
| Pound/square foot/hour | lb/(ft²·h) | 737.338 |
| Pound/square foot/minute | lb/(ft²·min) | 12.289 |
About this calculator
Mass flux density measures how much mass passes through a unit area of a surface each second, a quantity used in filtration, evaporation, and material transport calculations. This converter switches between metric units like kilograms per square meter per second and US or Imperial units like pounds per square foot per hour.
How it works in plain English
Mass flux density combines a mass unit, an area unit, and a time unit into one compound measurement, so the converter anchors every value to kilograms per square meter per second. Metric variants scale the mass component through grams and kilograms and the area component through square centimeters and square meters, while the time component runs from seconds through minutes, hours, and days.
US and Imperial units bring in the pound (0.45359237 kg) divided by the square foot (0.09290304 m²) and then by a chosen time unit, so pound per square foot per hour works out to about 1.35623 kg/(m²·h), or roughly 0.000376730 kg/(m²·s). Because area appears in the denominator, switching between square centimeters, square feet, and square meters changes the scaling factor in the opposite direction from switching between mass units.
Choose the from and to units, enter your value, and the converted mass flux density appears immediately, backed by a full table of the same quantity across every supported unit. A precision control sets how many decimal places display, and a swap button reverses the two selected units in one click.
The formula
- value_in_target = value_in_source × (source factor to kg/(m²·s)) ÷ (target factor to kg/(m²·s))
- 1 lb/(ft²·h) = 0.45359237 ÷ 0.09290304 ÷ 3600 = 0.00135623 kg/(m²·s)
- 1 g/(cm²·s) = 0.001 ÷ 0.0001 = 10 kg/(m²·s)
- 1 g/(m²·h) = 0.001 ÷ 3600 = 2.77778×10⁻⁷ kg/(m²·s)
Worked example
Suppose a filtration membrane specification lists a mass flux of 0.5 lb/(ft²·h) and an engineer wants that in kilograms per square meter per hour for a metric process comparison. Multiplying 0.5 by the pound-to-kilogram factor and dividing by the square-foot-to-square-meter factor gives about 2.44 kg/(m²·h).
Entering 0.5 into the pound-per-ft2-hour field with kilogram-per-m2-hour selected as the target shows roughly 2.44 kg/(m²·h) right away. Dividing that result by 3600 gives about 0.000678 kg/(m²·s), a useful extra step for confirming the answer against the shared kg/(m²·s) base used internally by the converter.
The full unit table also reports this same flux as about 0.000678 kg/(m²·s) and 0.0678 g/(m²·s), all calculated from that single entered value. Comparing the kilogram-based and gram-based rows is a fast way to check the calculation, since the gram figure is exactly 1000 times the kilogram figure for the same time and area basis.
Common mass flux density conversion factors
| Unit | Value in kg/(m²·s) |
|---|---|
| 1 kg/(m²·hour) | 0.000277778 |
| 1 g/(m²·second) | 0.001 |
| 1 g/(cm²·second) | 10 |
| 1 lb/(ft²·second) | 4.88243 |
| 1 lb/(ft²·hour) | 0.00135623 |
| 1 kg/(cm²·second) | 10,000 |
Standard unit definitions
Frequently asked questions
What kind of process typically reports mass flux density?
Filtration, membrane separation, drying, and evaporation processes commonly report mass flux density, since it describes how quickly material passes through or across a defined surface area. A higher mass flux generally indicates faster material transport through that surface under the given conditions.
Why does the area unit affect the conversion factor inversely?
Because area sits in the denominator of the unit, a larger area unit like square feet spreads the same mass over more surface, producing a smaller number, while a smaller area unit like square centimeters concentrates it, producing a larger number. This is the opposite direction compared to how a mass or time unit change affects the value.
How is mass flux density different from mass flow rate?
Mass flow rate describes total mass moving per unit time without reference to any surface area, such as kilograms per second through a pipe, while mass flux density describes that same kind of mass movement normalized by the area it passes through, such as kilograms per square meter per second. Dividing a mass flow rate by an area gives a mass flux density.
Can I convert a gram-per-square-centimeter-per-second lab reading into kilograms per square meter per hour?
Yes. Select gram-per-cm2-second as the from unit and kilogram-per-m2-hour as the target, then enter the reading. The converter applies the area-unit scaling and time-unit scaling together in a single calculation, so no manual unit-by-unit conversion is needed.
Why is 1 g/(cm²·s) equal to such a large number of kg/(m²·s)?
A square centimeter is a much smaller area than a square meter, by a factor of 10,000, so spreading the same one gram of mass per second over that much smaller area corresponds to a much larger flux when rescaled to a per-square-meter basis. That is why 1 g/(cm²·s) equals 10 kg/(m²·s) rather than a small fraction.
Related converters
Convert dynamic viscosity units: pascal-second, poise, centipoise and reyn.
Convert kinematic viscosity units: m²/s, stokes, centistokes and ft²/s.
Convert surface tension units: N/m, mN/m, dyne/cm, erg/cm² and lbf/in.
Convert water-vapour permeability units: perms, perm-inches and SI kg/(Pa·s·m²).