Float (nautical)

The British racing floatplane Supermarine S.6B (1931), sporting a pair of streamlined floats

A float (also called a pontoon) is an airtight hollow structure, similar to a pressure vessel, designed to provide buoyancy in water. Its principal applications are in watercraft hulls, aircraft floats, floating piers, aquaculture, pontoon bridges, and marine engineering applications such as salvage.