Measurement CPO Science Chapter 1 Measurement CPO Science

Measurements A measurement has two parts: 1. a number value Examples: 12, 3, 432, etc. 2. a unit Examples: meters, seconds, ninth graders

Two Systems of Measurement English (“American”) System - used for everyday measurement in the United States International System of Units or Metric System - used for everyday measurement in most other countries and for scientific measurements

The Metric System Base unit of length Base unit of mass Base unit of volume

Converting in the Metric System Move the decimal point: Move decimal to the right Move decimal to the left

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The Metric System Prefixes to memorize: yellow packet p. 2 List the 4 prefixes in order of size, starting with the smallest: milli < centi < [base unit] < kilo

The Metric System Summary milli < centi < [base unit] < kilo Example: 0.001 kilometer = ? meter = ? centimeters = ? millimeters

Converting in the Metric System SIZE compared to base unit NUMBER compared to base unit Example kilo- (k) [base unit] centi- (c) milli- (m) 1000x larger 1000x smaller 5 km=5000 m equal equal equal 100x smaller 100x larger 1200 cm=12 m 1000x smaller 1000x larger 8 mm=0.008 m

Accuracy and Precision Accuracy: how close a measurement is to the accepted, true value Precision: how close repeated measurements are to one another

Accuracy and Precision Are the pictures below accurate, precise, accurate and precise, or neither? 1 3 2 4