Rotational relaxation of water
Rotational relaxation of water:
| symbol | explanation | experimental value, and method | 
| HH | H-H axis | ps (H-H dipolar relaxation NMR) | 
| OH | O-H axis | ps (O-H dipolar relaxation NMR) | 
| dipolar axis | not measurable, but related to bulk dielectric relaxation | |
| normal to the molecule plane | not measurable | 
