The science or practice of measuring electrical charge, voltage, or potential using an electrometer or similar instruments.
From electro- + -metry (Greek 'metron' meaning 'measure'). Established as a scientific discipline in the 1700s-1800s as electrical measurement became crucial to understanding electricity.
Electrometry was how scientists proved that electricity was real and measurable rather than just an interesting party trick—it transformed electricity from curiosity to science.
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