Measurement: Basic Idea
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Measurement is the process of comparing an unknown physical quantity with an accepted standard quantity of the same kind.
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A complete measurement contains:
- a numerical value; and
- a unit.
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The International System of Units (SI) provides internationally accepted standard units.
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A measuring instrument detects, compares, records or displays the value of a physical quantity.
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A scale assigns numbers, grades or categories to the magnitude or intensity of a phenomenon.