(rail transport) A brake used on trains, working on the principle of keeping up a vacuum in a continuous pipe or pipes extending under the train, and in brake-cylinders connected to them under each vehicle, the air being sucked out by ejectors or pumps on the locomotive.

The vacuum in the Torricellian barometer.

plural of vacuum pan

A vessel for boiling saccharine juices in a partial vacuum in sugar-making.

A coarse vacuum, usually one where pressure remains at 0.1 to 1 millitorr.

(law) A state of regulation that is uncomfortable by there being no conspicuous provision for a certain situation.

present participle of vacuum-pack

Third-person singular simple present indicative form of vacuum pack

plural of vacuum pack

simple past tense and past participle of vacuum pack