Compute the capillary pressure difference from the liquid surface tension γ and the inner tube diameter D using ΔP = 4γ/D, for analysing water rise in fine tubes, soil seepage and surface-tension driven flow in microfluidics.
输入表面张力 γ 与管内径 D，求毛细压差。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Capillary pressure | Δp = 2σ·cosθ/r | Young-Laplace equation, 1805 |
| Capillary rise | h = 2σ·cosθ/(ρgr) | Jurin's law, 1718 |