Abstract: THE dielectric strength of air is 30 kv. per cm. at 0 deg. cent. and 76 cm. barometric pressure. It is proportional to the air density over a considerable range. It reaches a minumim in a ...

Vacuum sensors are used to measure vacuum or sub-atmospheric pressures. Vacuum means pressure below atmospheric. Since true vacuum is never attained, the measurement is in respect to a near absence of ...

In vacuum extraction, a rubber dome is placed on the baby's head, and this is connected by a tube to a pressure suction device. The doctor then pulls the baby's head using the vacuum pressure ...