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# Using the metric system

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### Using the metric system

1. 1. Measurement Using the Metric System in Science
2. 2. Precision v. Accuracy <ul><li>When an object is measured more than once, the measurements may vary. The closeness of a set of measured values to each other is called precision . </li></ul><ul><li>Many people confuse precision with accuracy. Accuracy is a measure of how close the values are to the actual value. </li></ul>
3. 3. The English System <ul><li>The system of measurement the United States uses. </li></ul><ul><li>Uses inches, feet, yards, and miles to measure length </li></ul><ul><li>Uses ounces and pounds to measure mass </li></ul><ul><li>Uses ounces and gallons to measure volume </li></ul>
4. 4. The Metric System <ul><li>The system of measurement used around the world not only in science but in everyday life. (Called Systeme Internationale…SI ) </li></ul><ul><li>The metric system is based on multiples of ten, making it very easy to understand, once you learn the vocabulary. </li></ul><ul><li>A metric prefix indicates how many times a basic unit (meter, liter, or gram) should be multiplied or divided by ten. </li></ul>
5. 5. English v. Metric Usage
6. 6. Some Real-World Examples: <ul><li>What does it mean when we say a lawyer makes 150K a year? </li></ul><ul><li>How do we express the storage capacity of a computer? </li></ul><ul><li>How do we describe the clarity of a digital camera? </li></ul><ul><li>How do we measure the daily vitamin allowances that should be in our diets? </li></ul>
7. 7. Metric Conversions-changing from one amount to another. <ul><li>You can use the metric prefixes to change from one length, mass, or volume to another in the metric system </li></ul><ul><li>You can use the acronym: </li></ul><ul><li>K ing H enry D ied… by… d rinking c hocolate m ilk </li></ul><ul><li>to help you with these conversions. </li></ul><ul><li>Each underlined letter represents a prefix and “by” represents the basic unit you are dealing with (gram, meter, liter) </li></ul>
8. 8. SI Prefixes     Prefix Symbol Meaning Multiply Unit by   Giga           Mega           Kilo           Hecto           Deca           deci           centi           milli           micro           nano