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The Mass Spectrometer. In order to measure the characteristics of individual molecules, a mass spectrometer converts them to ions so that they can be moved about and manipulated by external electric and magnetic fields. The three essential functions of a mass spectrometer, and the associated components, are:
The civilizations of the galaxy call it... Mass Effect. The mass effect is the (psuedo-)scientific principle behind most of the technologies in the series. For instance, the mass relays allow faster than light travel by exploiting the mass effect. It's also the reason why weapons have unlimited ammunition (what you're actually doing is venting a heat sink) and the way in which all of the biotic powers work.