Chapter 1 Measurement CPO Science Measurements A measurement

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 1. English (“American”) System - used for everyday measurement in the United States 2. 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 Ø 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 = ? centimeters = ? millimeters

Converting in the Metric System SIZE compared to base unit kilo(k) [base unit] NUMBER compared to base unit Example 1000 x larger 1000 x smaller 5 km=5000 m equal centi(c) 100 x smaller 100 x larger 1200 cm=12 m milli(m) 1000 x smaller 1000 x larger 8 mm=0. 008 m

Accuracy and Precision Ø Accuracy: how close a measurement is to the accepted, true value Ø 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