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Volumetric Flux

LMHtocm/s

Convert litres per square metre per hour (LMH) to centimetres per second (volumetric flux) (cm/s).

Factor1 LMH = 2.777778e-5 cm/s

Converter

LMH

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

Result
1cm/s

Rendered to 6 significant figures.

Formula

Formula
cm/s = LMH × 2.777778e-5

Multiply any value in litres per square metre per hour by 2.777778e-5 to obtain the value in centimetres per second (volumetric flux).

Worked example

Convert 36000 LMH to cm/s.

  1. 01Start with 36000 LMH.
  2. 02Multiply by the conversion factor: 36000 × 2.777778e-5 = 1 cm/s.
Result36000 LMH = 1 cm/s

Conversion table

LMHcm/s
12.7778e-5
25.5556e-5
50.00013889
100.00027778
200.00055556
500.0013889
1000.0027778
2000.0055556
5000.013889
10000.027778

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from LMH to cm/s?
1 LMH equals 2.777778e-5 cm/s. To convert, multiply the value in litres per square metre per hour by 2.777778e-5.
How do I convert 1 LMH to cm/s?
1 LMH = 2.77778e-5 cm/s. For any value, multiply by 2.777778e-5.
How do I convert cm/s back to LMH?
Divide by the same factor — or equivalently, multiply by 36000. So 1 cm/s = 36000 LMH.
When would I need to convert litre per square metre per hour to centimetre per second (volumetric flux)?
Volumetric-flux conversions between LMH and cm/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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