Surface Tension & Capillary Rise Calculator

Interfacial Chemistry, Capillarity & Surface Tension Metrology

Surface Tension is the energy required to increase the surface area of a liquid by one unit:

• **

• Universal Surface Tension Conversion Formulas (IUPAC Standards)**:

$$1\text{ mN/m} \equiv 1\text{ dyn/cm} \equiv 1\text{ mJ/m}^2 = 0.001\text{ N/m} = 0.001\text{ J/m}^2$$

$$\gamma_{\text{lbf/ft}} = \frac{\gamma_{\text{N/m}}}{14.593903} = \gamma_{\text{N/m}} \times 0.0685218$$

$$\gamma_{\text{lbf/in}} = \frac{\gamma_{\text{N/m}}}{175.126835} = \gamma_{\text{N/m}} \times 0.00571015$$

• **

• Jurin's Law of Capillary Rise & Young-Laplace Equation**:

$$h = \frac{2 \gamma \cos\theta}{\rho \times g \times r} \quad (\text{Capillary Rise Height in mm})$$

$$\Delta P = \frac{2 \gamma}{r} \quad (\text{Young-Laplace Droplet Excess Pressure in Pascals})$$

• **

• Standard Liquid Interface Benchmarks (@ 20°C)**:

• Pure Ethanol: $\mathbf{22.10\text{ mN/m}} \implies 22.10\text{ dyn/cm} \implies h = 11.42\text{ mm}$

• Detergent SDS Solution: $\mathbf{30.00\text{ mN/m}} \implies 30.00\text{ dyn/cm} \implies h = 12.24\text{ mm}$

• Human Blood Plasma: $\mathbf{58.00\text{ mN/m}} \implies 58.00\text{ dyn/cm}$

• Pure Liquid Water: $\mathbf{72.80\text{ mN/m}} \implies \mathbf{0.07280\text{ N/m}} \implies \mathbf{h = 29.74\text{ mm}}$

• Liquid Mercury ($Hg$): $\mathbf{486.5\text{ mN/m}} \implies \theta = 140^\circ \implies \mathbf{h = -11.47\text{ mm}}$ (Capillary depression)

How to Use This Calculator

Enter Surface Tension Magnitude, From Surface Tension Unit, To Surface Tension Unit, Capillary Tube Radius (r in mm) into the input fields and the calculator will instantly compute Converted Target Surface Tension, Surface Tension in SI. All calculations happen in real time — no submission or page reload required. You can adjust any input value and see the result update immediately.

Understanding Your Result

The Surface Tension & Capillary Rise result gives you a precise, calculated value based on the inputs you provide. Compare your result against published benchmarks from NIST, BIPM, and ISO 80000 to assess where you stand. A single calculation is a useful starting point, but tracking this metric over time — as inputs change — gives you a much more complete picture.

Practical Application

The Surface Tension & Capillary Rise is most useful when you have specific, real-world data to enter. For example: enter your actual Surface Tension Magnitude to calculate your converted target surface tension. The result helps engineers, scientists, students, and international traders make informed decisions about converting between measurement units for science, engineering, and commerce. This calculator is trusted by professionals and individuals alike because it follows the exact formulas validated by NIST, BIPM, and ISO

80000.

Accuracy Notes and Limitations

For legal or trade filings, verify conversions against official government or standards body references. The accuracy of any calculator is limited by the quality of the inputs provided. Double-check your units before entering values — unit errors are the most common source of incorrect results. For critical decisions, cross-reference with at least one additional source or professional consultation.

Frequently Used With

This calculator is often used alongside other conversion tools to build a complete analytical picture. Combining multiple related calculations provides stronger evidence for decisions than relying on any single metric. Browse the Conversion category to find complementary calculators for your specific use case.