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Surface Tension

lbf/intoN/m

Convert pounds-force per inch (surface tension) (lbf/in) to newtons per metre (surface tension) (N/m).

Factor1 lbf/in = 175.1268 N/m

Converter

lbf/in

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

Result
175.127N/m

Rendered to 6 significant figures.

Formula

Formula
N/m = lbf/in × 175.1268

Multiply any value in pounds-force per inch (surface tension) by 175.1268 to obtain the value in newtons per metre (surface tension).

Worked example

Convert 1 lbf/in to N/m.

  1. 01Start with 1 lbf/in.
  2. 02Multiply by the conversion factor: 1 × 175.1268 = 175.127 N/m.
Result1 lbf/in = 175.127 N/m

Conversion table

lbf/inN/m
1175.13
2350.25
5875.63
101751.3
203502.5
508756.3
10017513
20035025
50087563
10001.7513e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from lbf/in to N/m?
1 lbf/in equals 175.1268 N/m. To convert, multiply the value in pounds-force per inch (surface tension) by 175.1268.
How do I convert 1 lbf/in to N/m?
1 lbf/in = 175.127 N/m. For any value, multiply by 175.1268.
How do I convert N/m back to lbf/in?
Divide by the same factor — or equivalently, multiply by 0.005710147. So 1 N/m = 0.00571015 lbf/in.
When would I need to convert pound-force per inch (surface tension) to newton per metre (surface tension)?
Surface-tension conversions between lbf/in and N/m appear in coatings and wettability work, surfactant and interfacial-tension measurement, foam and emulsion characterisation, and capillary/droplet-engineering datasheets. mN/m, dyn/cm and mJ/m² are exact numerical equivalents — they appear interchangeably across SI, CGS and surface-free-energy notations. lbf/ft and lbf/in are common in US petroleum interfacial-tension datasheets and US coatings documentation. This category does not include temperature-dependent material lookups or capillary/contact-angle calculators.
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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