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Volumetric Flux

LMHtom³/m²/s

Convert litres per square metre per hour (LMH) to cubic metres per square metre per second (m³/m²/s).

Factor1 LMH = 2.777778e-7 m³/m²/s

Converter

LMH

Accepts numbers or expressions, e.g. 150 + 14.7

Result
0.277778m³/m²/s

Rendered to 6 significant figures.

Formula

Formula
m³/m²/s = LMH × 2.777778e-7

Multiply any value in litres per square metre per hour by 2.777778e-7 to obtain the value in cubic metres per square metre per second.

Worked example

Convert 1.00000e+6 LMH to m³/m²/s.

  1. 01Start with 1.00000e+6 LMH.
  2. 02Multiply by the conversion factor: 1.00000e+6 × 2.777778e-7 = 0.277778 m³/m²/s.
Result1.00000e+6 LMH = 0.277778 m³/m²/s

Conversion table

LMHm³/m²/s
12.7778e-7
25.5556e-7
51.3889e-6
102.7778e-6
205.5556e-6
501.3889e-5
1002.7778e-5
2005.5556e-5
5000.00013889
10000.00027778

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from LMH to m³/m²/s?
1 LMH equals 2.777778e-7 m³/m²/s. To convert, multiply the value in litres per square metre per hour by 2.777778e-7.
How do I convert 1 LMH to m³/m²/s?
1 LMH = 2.77778e-7 m³/m²/s. For any value, multiply by 2.777778e-7.
How do I convert m³/m²/s back to LMH?
Divide by the same factor — or equivalently, multiply by 3600000. So 1 m³/m²/s = 3.60000e+6 LMH.
When would I need to convert litre per square metre per hour to cubic metre per square metre per second?
Volumetric-flux conversions between LMH and m³/m²/s are routine in membrane filtration (RO, UF, MF, NF permeate flux), hydraulic loading specification, water-treatment design, hydrometallurgy and packed-bed column loading, and environmental engineering. LMH (L/m²/h) and gfd (gal/ft²/day) dominate membrane datasheets; m³/m²/h and m³/m²/day cover SI engineering ladders; m/day and cm/s appear as superficial velocity in hydromet and packed-bed work. Volumetric flux is the same physical quantity as superficial velocity (m³/m²/s ≡ m/s) but is kept distinct from the velocity and flow categories because the engineering intent is volumetric throughput per unit area, not bulk motion or total throughput.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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