Calculator Inputs
Example Data Table
| Scenario | γsv (mN/m) | γsl (mN/m) | γlv (mN/m) | Computed θ (deg) |
|---|---|---|---|---|
| Moderate wetting coating | 45.0 | 12.0 | 72.8 | ≈ 63.1 |
| Low-energy surface | 25.0 | 20.0 | 50.0 | ≈ 84.3 |
| Non-wetting tendency | 30.0 | 45.0 | 40.0 | ≈ 111.0 |
Values are illustrative for practice and validation.
Formula Used
Young’s equation relates the equilibrium contact angle to interfacial energies:
cos(θ) = (γsv − γsl) / γlv
From this, you can solve for any unknown term (θ, γsv, γsl, or γlv). Two helpful derived quantities are:
- Work of adhesion: W = γlv(1 + cosθ)
- Spreading parameter: S = γsv − (γsl + γlv)
How to Use This Calculator
- Select the calculation mode that matches your unknown.
- Choose the unit system for γ values (mN/m or N/m).
- Enter the required known quantities for the selected mode.
- Click Calculate to display results above the form.
- Use the CSV or PDF buttons to export the same inputs and outputs.
Practical Notes
- If your computed cosθ exceeds ±1, the inputs are inconsistent.
- When θ is near 90°, solving for γlv becomes unstable.
- Surface roughness and heterogeneity can shift measured angles.
- Use consistent temperature and cleanliness for reliable comparisons.
Accurate contact angles guide better coating and adhesion decisions.