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sci.surface-tension Calculator
Calculates surface tension effects: capillary rise height, droplet pressure (Young–Laplace equation), and contact angle from surface energy. Water has surface tension 72.8 mN/m at 25 °C — capillary rise of water in a 0.1 mm radius tube is approximately 14.8 cm.
Inputs
Gamma
Reference formula or conversion factor shown for context.
Radius
Distance from centre to edge of a circle. Radius = diameter / 2.
Density
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Contact Angle
Reference formula or conversion factor shown for context.
Results
capillary rise (mm)
Reference formula or conversion factor shown for context.
excess pressure (Pa)
Reference formula or conversion factor shown for context.
surface tension (mN/m)
The tensile force or stress — the pulling force that stretches the material. Must stay below the material's tensile strength.
Jurin: h = 2*gamma*cos(theta)/(rho*g*r)
Sample size or count used in the calculation.
water contact angle
The computed angle in degrees or radians.
water surface tension at 25C
The tensile force or stress — the pulling force that stretches the material. Must stay below the material's tensile strength.