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Units of Measurement

Units of Measurement. A measured quantity must have BOTH a number and a unit. The units most often used for scientific measurement are those of the metric system. In 1960 the International System of Units (SI units) was proposed as a replacement for the Metric System.

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Units of Measurement

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  1. Units of Measurement • A measured quantity must have BOTH a number and a unit. • The units most often used for scientific measurement are those of the metric system. • In 1960 the International System of Units (SI units) was proposed as a replacement for the Metric System. • Système International = International System • The seven base units for the SI system are given below

  2. Common Prefix Multipliers in the SI System Prefix converts the base unit into a unit that is close to the size of the quantity being measured. Memorize these conversions

  3. Practice: Prefixes Use the prefixes or numbers to answer questions below. 1. Complete the following with metric prefix: • 103 gram = 1 ___ g b) 10-2 meter = 1 ___ m 2. Complete the following with a number: • 4.8 nanosecond = _________s • b) 1.5 microgram = ________ g 3. Which quantity is the smallest? 1 mg, 1 ng, or 1 pg?

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