ultravacuum

名词 n.
中文释义

英文释义

名词 n.
  1. A nearly perfect vacuum; i.e. an almost or fully complete absence of matter, especially a gas at very low pressure.
    — The operating principles employed in the thermal and ionization gauges are to be contrasted with the mercury manometer and Bourdon tube type vacuum gauges which have been used for years. The mechanics of these latter gauges seriously limit their use to the continuous measurement of high and ultravacuums.

词形变化

ultravacuums plural ultravacua plural

词源

Etymology tree
English ultra-
English vacuum
English ultravacuum
From ultra- + vacuum.
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