physical quantity
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A physical quantity is a measurable characteristic of something in the physical world—like the length of an object, the temperature of water, or the speed of a moving car. Physical quantities matter because they let us describe and understand the natural world in precise, numerical terms rather than just general observations.
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Ampèremetre (Ammeter)
A physical quantity (or simply quantity) is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a value, which is a pair of a numerical value and a unit of measurement. For example, the physical quantity mass, symbol m, can be quantified as m=n kg, where n is the numerical value and kg is the unit symbol (for kilogram). Vector quantities have, besides numerical value and unit, direction or orientation in space.