Mass-to-charge ratio

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The mass-to-charge ratio is a physical quantity (it is an amount that can be measured). The SI unit is kg/C, which is kilograms divided by the coulomb. Sometimes the charge-to-mass ratio is used instead.

In a vacuum, all particles with the same mass-to-charge ratio move in the same path, when in the same strength of electric and magnetic fields.

It is important for things like mass spectrometry.