1. the reddish, porous, brittle coating that is formed on iron especially when chemically attacked by moist air and that consists essentially of hydrated ferric oxide and sometimes iron carbonates and iron sulfates. 2. similar coating provided on any of various metals by corrosion.
a switch in which an electric circuit is closed and opened by tilting a reservoir of liquid mercury.
a small hole placed in the wall of a dip tube to prevent back syphonage beyond the level in the tank at which the anti-siphon hole is found.
1. to spread by or as if by wiping. 2. to form a joint between lead pipes, by applying solder in repeated increments individually spread and shaped with greased cloth pads.
sludge floc produced in raw or settled sewage by the growth of zooglea and other organisms in the presence of dissolved oxygen, and accumulated in sufficient concentration by returning floc previously formed.
triglyceride esters of fatty acids, erroneously used as a synonym for grease.
the collection of substances immersed in a liquid by taking advantage of variable specific gravities, or by the buoyance produced by the evolution of gas by chemicals or heat.