Surface Tension Calculator
Compute capillary rise height due to surface tension.
How to Use This Calculator
1
Enter fluid properties
Surface tension γ and density ρ at your working temperature.
2
Enter geometry
Contact angle and capillary radius. Smaller radius increases rise.
Formula
h = 2 γ cosθ / (ρ g r)
Valid for narrow tubes where meniscus curvature is maintained; ignores evaporation and dynamic effects.
Frequently Asked Questions
What’s a typical γ for water?
Around 0.072–0.073 N/m at room temperature; it decreases with temperature.
Why is θ important?
Contact angle encodes wetting; cosθ reduces rise for poor wetting (θ greater than 0°).