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Surface Tension Converter

Convert between surface tension units: newton per meter (N/m), millinewton per meter, dyne per centimeter, erg per square centimeter, and more.

What this tool does

Convert between surface tension units: newton per meter (N/m), millinewton per meter, dyne per centimeter, erg per square centimeter, and more. Type an amount in millinewtons per meter, choose the units, and the tool converts it to dynes per centimeter. It offers 11 surface tension units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 11 options, including Newton per meter, Millinewton per meter, Micronewton per meter, Joule per square meter, Dyne per centimeter, Erg per square centimeter. Starts as Millinewton per meter.
  • To: Choose one of the same 11 units as "From". Starts as Dyne per centimeter.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Millinewtons per meter and dynes per centimeter are the same size, so the number does not change: an amount in millinewtons per meter is the same amount in dynes per centimeter.

Sources: Millinewton per meter: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes). Dyne per centimeter: exact by definition.

Limitations

  • Converts the unit of a surface tension only. It does not predict the surface tension of a liquid.
  • Pound-force, kilogram-force and gram-force units use the international pound and standard gravity (9.80665 m/s²). The poundal is one pound foot per second squared.

FAQs

Q: Is one mN/m the same as one dyn/cm?
A: Yes. One millinewton per meter equals exactly one dyne per centimeter, and also one erg per square centimeter.
Q: How many N/m is one lbf/ft?
A: One pound-force per foot is about 14.594 N/m.
Q: Why is N/m the same as J/m²?
A: A joule is a newton meter, so one joule per square meter reduces to one newton per meter. Surface tension can be read as a force along a line or as energy per unit area.

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