Millinewtons to Dynes: 1 mN equals 100 dyn. To convert millinewtons to dynes, multiply by 100 (dyn = mN × 100). For example, 10 mN = 1000 dyn.
How to Convert Millinewtons to Dynes
To convert from millinewtons to dynes, multiply the value by 100. The conversion is linear, meaning doubling the input doubles the output.
Conversion Formula
- Millinewtons to Dynes:
dyn = mN × 100 - Dynes to Millinewtons:
mN = dyn ÷ 100
Millinewtons to Dynes Conversion Chart
| Millinewtons (mN) | Dynes (dyn) |
|---|---|
| 0.1 | 10 |
| 0.25 | 25 |
| 0.5 | 50 |
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
| 5 | 500 |
| 10 | 1000 |
| 20 | 2000 |
| 25 | 2500 |
| 50 | 5000 |
| 100 | 10000 |
| 250 | 25000 |
| 1000 | 100000 |
Understanding the Units
What is a Millinewton?
A millinewton equals one thousandth of a newton.
Common contexts: precision instruments, biomechanics.
What is a Dyne?
A dyne equals exactly 10⁻⁵ newtons — the CGS unit of force, defined as the force needed to accelerate one gram by one centimeter per second squared.
Common contexts: surface tension, older physics texts.
How to Convert Millinewtons to Dynes
To convert millinewtons to dynes, multiply by 100. The conversion is exact, with no rounding involved, because the newton and the dyne are both built from coherent metric base units — they differ only in whether mass is measured in kilograms or grams and length in metres or centimetres.
Conversion Formula
- Millinewtons to Dynes: dyn = mN × 100
- Dynes to Millinewtons: mN = dyn ÷ 100
- Scientific notation: 1 mN = 1 × 10² dyn
Because both units share the same dimensional basis (mass × length / time²), the factor is dimensionally exact. No experimental uncertainty enters the conversion.
Common Conversions
| Millinewtons (mN) | Dynes (dyn) | Scientific Notation |
|---|---|---|
| 0.1 | 10 | 1 × 10¹ dyn |
| 0.5 | 50 | 5 × 10¹ dyn |
| 1 | 100 | 1 × 10² dyn |
| 2.5 | 250 | 2.5 × 10² dyn |
| 3.7 | 370 | 3.7 × 10² dyn |
| 5 | 500 | 5 × 10² dyn |
| 7.5 | 750 | 7.5 × 10² dyn |
| 10 | 1,000 | 1 × 10³ dyn |
| 15 | 1,500 | 1.5 × 10³ dyn |
| 25 | 2,500 | 2.5 × 10³ dyn |
| 50 | 5,000 | 5 × 10³ dyn |
| 72.8 | 7,280 | 7.28 × 10³ dyn |
| 100 | 10,000 | 1 × 10⁴ dyn |
| 500 | 50,000 | 5 × 10⁴ dyn |
Understanding the Units
What Is a Millinewton?
The millinewton (symbol: mN) is the SI unit of force scaled down by 1,000 — one thousandth of a newton, defined as 10⁻³ kg·m/s². It is the natural unit for forces too small to express conveniently in newtons but too large for micronewtons: the weight of small insects, the tension in a textile yarn, the wetting force of a droplet, or the pull of a small magnet.
What Is a Dyne?
The dyne (symbol: dyn) is the unit of force in the centimetre–gram–second (CGS) system. One dyne is the force required to accelerate a one-gram mass at one centimetre per second squared: 1 dyn = 1 g·cm/s² = 10⁻⁵ N. The name comes from the Greek dynamis, meaning power or force. The dyne was the standard force unit in physics well into the twentieth century before SI displaced CGS.
The CGS / SI Bridge
Although SI is universal in modern engineering, the dyne survives where CGS conventions were locked in long ago — surface tension, magnetic and electrostatic field equations (Gaussian units), and historical astrophysics texts. The clean factor of 100 between mN and dyn makes interconversion painless:
- 1 N = 100,000 dyn = 10⁵ dyn
- 1 mN = 100 dyn
- 1 µN = 0.1 dyn
- 1 dyn = 10 µN = 0.01 mN
Surface Tension and Small-Force Measurement
Surface tension is one of the few quantities still routinely tabulated in dyne-based units, because the historical Du Noüy ring and Wilhelmy plate tensiometers were calibrated in dyn/cm. Conveniently, dyn/cm and mN/m are numerically identical (both equal mJ/m²), so values translate directly:
| Liquid (20 °C) | Surface Tension | Equivalent |
|---|---|---|
| Water | 72.8 mN/m | 72.8 dyn/cm |
| Ethanol | 22.1 mN/m | 22.1 dyn/cm |
| Mercury | 486 mN/m | 486 dyn/cm |
| Olive oil | 32 mN/m | 32 dyn/cm |
| Glycerol | 63 mN/m | 63 dyn/cm |
| Soap solution | 25 mN/m | 25 dyn/cm |
In wetting and adhesion testing, "dyne pens" mark substrates with inks ranging from 30 to 56 dyn/cm. A film whose surface energy is below the ink's value fails the bead test — a critical check for printability in the flexible-packaging industry.
Related Force Converters
- Dynes to Newtons — full-scale CGS-to-SI conversion
- Newtons to Dynes — SI to CGS, the canonical 10⁵ factor
- Millinewtons to Newtons — step up the SI ladder
- Millinewtons to Micronewtons — step down by 10³
- Newtons to Millinewtons — the reverse SI prefix step
Brief History
The dyne was defined in 1873 by the British Association for the Advancement of Science as part of the codification of the centimetre–gram–second system. For decades it was the standard force unit in physics, particularly in electromagnetism, where the Gaussian-unit force equations were written in dynes per esu² per cm².
The newton displaced the dyne in 1948, when the 9th General Conference on Weights and Measures formally adopted it as the SI derived unit of force. The millinewton followed naturally from the SI prefix system, standardised in 1960. Today the dyne survives mainly in surface-tension data sheets, MEMS testing standards, and older physics texts — but the 100-to-1 ratio means conversion between mN and dyn remains one of the cleanest in all of metrology.