The difference between static and dynamic pressure?
Moving an object through the water requires more force than moving it through air. This force shows as an increase in pressure on the side that is forcing the water away. This is usually not significant to divers except when we jump in from a jetty or the back of a boat and hit the water at some speed. However the term ‘dynamic pressure’ is used as an excuse to explain why a watch that is apparantly rated to 50 meters leaks in a swimming pool and the manufacturer then crys out on the warrantee claiming missuse.
