Table 1.
Hydrostatic and Laplace pressures associated with isolated drops
| Parameter | Drop volume (μl) | |||
|---|---|---|---|---|
| 2.5 | 5 | 10 | 20 | |
| Drop height (mm) | 0.88 | 1.10 | 1.39 | 1.75 |
| Base radius (mm) | 1.25 | 1.58 | 1.98 | 2.50 |
| Base area (mm2) | 4.91 | 7.79 | 12.37 | 19.64 |
| Hydrostatic pressure, FC40 (Pa) | 38.56 | 34.43 | 29.23 | 22.67 |
| Hydrostatic pressure, water (Pa) | 8.59 | 10.82 | 13.63 | 17.17 |
| Laplace pressure (Pa) | 60.13 | 47.73 | 37.88 | 30.07 |
| Pressure at base of drop (Pa) | 107.28 | 92.98 | 80.74 | 69.91 |
Drops have volumes specified and sit on a flat substrate (values calculated assuming a contact angle of 70°, an interfacial tension of 40 mN/m, and an overlay of FC40 with a depth of 3 mm)