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Permeability

µm²tonD

Convert square micrometres (permeability) (µm²) to nanodarcy (nD).

Factor1 µm² = 1.01325e+9 nD

Converter

µm²

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

Result
1.01325e+9nD

Rendered to 6 significant figures.

Formula

Formula
nD = µm² × 1.01325e+9

Multiply any value in square micrometres (permeability) by 1.01325e+9 to obtain the value in nanodarcy.

Worked example

Convert 1 µm² to nD.

  1. 01Start with 1 µm².
  2. 02Multiply by the conversion factor: 1 × 1.01325e+9 = 1.01325e+9 nD.
Result1 µm² = 1.01325e+9 nD

Conversion table

µm²nD
11.0132e+9
22.0265e+9
55.0662e+9
101.0132e+10
202.0265e+10
505.0662e+10
1001.0132e+11
2002.0265e+11
5005.0662e+11
10001.0132e+12

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from µm² to nD?
1 µm² equals 1.01325e+9 nD. To convert, multiply the value in square micrometres (permeability) by 1.01325e+9.
How do I convert 1 µm² to nD?
1 µm² = 1.01325e+9 nD. For any value, multiply by 1.01325e+9.
How do I convert nD back to µm²?
Divide by the same factor — or equivalently, multiply by 9.869233e-10. So 1 nD = 9.86923e-10 µm².
When would I need to convert square micrometre (permeability) to nanodarcy?
Permeability conversions between µm² and nD appear in petroleum and reservoir engineering, hydrogeology, geotechnical engineering, packed-bed filtration and porous-materials research. The darcy (D) and its sub-multiples (mD, µD, nD) dominate petroleum-engineering documentation; SI area-equivalent units (m², µm², mm², cm², ft²) appear in geophysics and porous-media research. Intrinsic permeability is a property of the porous medium alone — this category does NOT include hydraulic conductivity (m/s, requires fluid density and viscosity), gas permeability (Klinkenberg slip corrections) or membrane-permeability coefficients, all of which are different physical quantities and require explicit assumptions.
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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