a blue colored matter from lichens that turns red in acid solutions and remains blue in alkaline solutions and is used as an acid-base indicator.

a colorless, tasteless, odorless gas in the atmosphere and is used in oxyacetylene and oxyhydrogen flames in welding and cutting metals and other metallurgical processes in chemical industries and combustion processes.

1. in water correction, the prevention of the discharge of the metallic ions of a conduit from going into solution by increasing the pH-value of the water, removing the free oxygen from the water, and controlling the carbonate balance. 2. the sequestration of metallic ions and the formation of protective films on metal surfaces by […]

the gradual deterioration or destruction of a substance or material by chemical action. Frequently induced by electron-chemical process.

a hemispherical rose reamer used in finishing the recess for a ball joint.

a device in a faucet in which water flow can be automatically directed from the faucet spout to a spray or other attachment.

1. a bearing in which the journal turns upon loose hardened steel balls that roll in a race and thus convert sliding friction into rolling friction. 2. a bearing in which the disk of a watt-hour meter is mounted on a vertical shaft that rotates with minimized friction because of rolling action on a single […]