Surface Tension Converter
Convert between mN/m, dyn/cm, and other surface tension units
Surface Tension Converter
Conversion Relationship
1 mN/m = 1 dyn/cm = 1 erg/cm² = 0.001 N/m = 0.001 J/m²
Common Conversions
Converted Values
Common Substances
Common Liquids
Alcohols
Metals
Solvents
Oils
Surfactants
Biological Fluids
Fuels
Cryogenic Liquids
Applications of Surface Tension
Water Striders
These insects can walk on water because their weight is not enough to break the water's surface tension
Capillary Action
The rise of liquids in narrow tubes against gravity, crucial for plant nutrient transport
Detergents
Reduce water's surface tension to improve wetting and cleaning properties
Droplet Formation
Surface tension causes liquids to form spherical droplets to minimize surface area
Floating Objects
Small dense objects can float on water due to surface tension supporting their weight
Pulmonary Surfactant
Reduces surface tension in the lungs to prevent collapse of alveoli during breathing
Understanding Surface Tension
Surface tension is the phenomenon that causes the surface of a liquid to behave like an elastic sheet. It results from the cohesive forces between liquid molecules.
Molecular Explanation
Molecules at the surface experience an inward pull from other molecules below, creating tension that minimizes the surface area. This is why:
- Liquids form spherical droplets
- Some insects can walk on water
- A needle can float on water despite being denser
- Capillary action occurs in narrow tubes
Factors Affecting Surface Tension
- Temperature: Surface tension decreases as temperature increases
- Surfactants: Substances like soap dramatically reduce surface tension
- Dissolved substances: Can either increase or decrease surface tension
- Molecular forces: Stronger intermolecular forces lead to higher surface tension
- Electric fields: Can modify surface tension of polarizable liquids
Measurement Methods
Du Noüy Ring Method
Measures the force needed to pull a ring from a liquid surface
Wilhelmy Plate Method
Measures force on a thin plate partially immersed in liquid
Pendant Drop Method
Analyzes the shape of a hanging droplet
Capillary Rise Method
Measures height of liquid rise in a narrow tube
Was this converter helpful? Let us know how we can improve it!
☕ Support UnitGenie
If this tool has been helpful, consider buying me a coffee to support development and keep it free for everyone!
Surface Tension Visualization
Water is in this category; substances with strong hydrogen bonding
Capillary Action
Similar Substances
Properties & Effects
Mobile tip: Swipe left or right on the unit dropdown to quickly change units, or use the arrow buttons
About the Surface Tension Converter
Convert between mN/m, dyn/cm, and other surface tension units All conversions run instantly in your browser and nothing you enter is sent to a server.
Common Conversion Formulas
| From | To | Formula |
|---|---|---|
| Newtons per meter (N/m) | Dynes per centimeter (dyn/cm) | dyn/cm = N/m × 1000 |
| Millinewtons per meter (mN/m) | Dynes per centimeter (dyn/cm) | dyn/cm = mN/m |
| Capillary Rise (h) | Surface Tension (γ), Liquid Density (ρ), Tube Radius (r) | h = 2γ / (ρgr) |