dWσ | = σ dA | |
= σ (4 π (r + dr)2 - 4 π r2) | ||
= σ 8 π r dr | (wegen dr << r) |
Flüssigkeit | Festkörper | σ [N/m] |
Wasser | Glas | ![]() |
Wasser | Graphit | 0.005 |
Wasser | Kupfer | ≥ 0.073 |
Quecksilber | Glas | 0.35 |
Quecksilber | Stahl | 0.43 |
Glycerin | Glas | ≥ 67 |
Luft | Glas | 0.1 - 0.9 |
FG | = ρ V g |
= ρ h π r2 g |
Fp | = p π r2 |
= 2 σ π r cos α |