Vacuum balance

Japanese: 真空天秤 - しんくうてんびん（英語表記）vacuum balance

This is a device in which a balance is placed in a vacuum vessel, which is evacuated and all balance operations can be performed from outside the vessel. It is used for mass measurements in which it is necessary to eliminate external influences by performing measurements in air. In addition to the traditional mechanical manual balances and direct reading balances, electric balances that are easy to operate remotely are often used these days, and weighing capacities range from a few kilograms used in research on mass standards to a few milligrams used in research on physical properties. The vessel is a vacuum-resistant glass bell or a metal vessel with a viewing window, and a vacuum pump is used for evacuation.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

真空容器にてんびんを納めて排気し，容器外部からすべてのてんびん操作ができる装置をいう。空気中で測定することによる外界からの影響を除く必要のある質量測定に用いる。てんびんには従来の機械式の手動てんびん，直示てんびんのほか，最近では遠隔操作の容易な電気てんびんが多く使用され，秤量は質量標準の研究に用いる数kgから物性研究用の数mgに及ぶ。容器は耐真空構造のガラス製の鐘，あるいはのぞき窓付き金属製容器で，排気には真空ポンプを使用する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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