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The mechanisms of adhesion under dry, wet and immersed conditions. Relative importance: 
– usually important, 
– usually not important.
| dry conditions | wet conditions (liquid film) | immersed conditions | |
| mechanical interlocking |  |
 |
 |
| electrostatic forces |  |
 |
 |
| chemical bonding |  |
 |
 |
| van der Waals forces |  |
 |
 |
| capillary forces |  |
 |
 |
| viscous forces |  |
 |
 |
