背圧

backing pressure

[目次：真空系]

(気体を大気圧（10⁵Pa）以下の圧力空間に排出するとき、)真空ポンプの排気口(排出口)での圧力。

(When gasses are exhausted to a space with a pressure equal to or below atmospheric pressure (10⁵ Pa),) the pressure at the exhaust port (outlet) is called the "backing pressure."