Penta Laboratories, a manufacturer in Newbury Park, Calif., makes vacuum tubes for radio transmitters and other purposes.

Carburetors with vacuum lines are still found on classic vehicles and small-displacement engines — but what is the vacuum actually used for? Let's take a look.

Scientists may have found the first evidence of underground tunnels lurking beneath the surface of Venus, carved by the planet’s ancient volcanic activity. A team of researchers from the University of ...

Abstract: With the development of conventional wheel high speed railway, the Vacuum Tube High-speed Flying Train (high-speed flying train) has gradually entered people's vision. In order to guarantee ...