4 Matching Annotations
- Sep 2021
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chem.libretexts.org chem.libretexts.org
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To understand chemistry, we need a clear understanding of the units chemists work with and the rules they follow for expressing numbers. The next two sections examine the rules for expressing numbers.
Around the world, people use different kinds of measurements.
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A quantity is an amount of something and consists of a number and a unit. The number tells us how many (or how much), and the unit tells us what the scale of measurement is.
the thing you measure with.
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emperature, height, weight, and perhaps blood pressure
different things you can measure.
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When you follow these instructions, you are measuring
Any way to limit or define an amount of anything, it's a measurement.
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