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THE “METRIC SYSTEM”

THE “METRIC SYSTEM”. Don't sigh when you use SI. Sally Student Horace Mann Middle School. WHY USE METRICS?. 10. 10. Based on powers of 10 so it is easy to convert Used by almost all of the countries in the world It is the language of scientists. 01. 10. How far is it?.

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THE “METRIC SYSTEM”

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  1. THE “METRIC SYSTEM” Don't sigh when you use SI Sally Student Horace Mann Middle School

  2. WHY USE METRICS? 10 10 • Based on powers of 10 so it is easy to convert • Used by almost all of the countries in the world • It is the language of scientists 01 10 How far is it? (In America we would say 59 miles)

  3. HOW DID IT GET STARTED? • The modern metric system is really called the Systeme International d’Unités (SI) • The original system was first proposed in 1585 by Simon Stevin in his book “The Tenth” – he suggested that a decimal system be used for weights and measures, coinage, and divisions of the degree of arc

  4. HOW DID IT GET STARTED?(Part 2) • Thomas Jefferson (1790) proposed a decimal-based measurement system for the United States • France’s Louis XVI (1790) authorized scientific investigations aimed at a reform of French weights and measures – these investigations led to the first “metric” system

  5. HOW DID IT GET STARTED?(Part 3) • The U.S. Mint (1792) produced the world’s first decimal currency (the U.S. dollar has 100 cents) • France (1795) officially adopted the metric system • 1954 – The International System of Units began its development SI

  6. BASIC UNITS There are three basic units used in the metric system (SI): 1. gram (mass) 2. meter (distance) 3. liter (volume) They are all related.

  7. RELATIONSHIPS BETWEEN BASICS Forward to Common Symbols • 1 meter (m) is 1/10,000,000 of the distance between the Equator and the North Pole • 1/100 of a meter is a centimeter (cm) • 1 cubic centimeter (cm3) of water equals 1 gram (g) • The volume occupied by 1 cm3 is 1 milliliter (mL)

  8. THEREFORE: • 1 cm3 = 1 mL • 1 cm3 of water = 1 g (= 1 mL) • 1 L of water = 1 kg (= 1 dam) (SEE HOW EASY THIS IS?)

  9. COMMON SYMBOLS Back to Relationships

  10. METRIC CONVERSIONS Kilo- 1000 Hecto- MOVE DECIMAL ONE PLACE TO RIGHT FOR EACH STEP 100 For an example, click here Deka- 10 BASE = METER, LITER, GRAM 1 MOVE DECIMAL ONE PLACE TO LEFT FOR EACH STEP Deci- 0.1 Centi- 0.01 For an example, click here Milli- 0.0010

  11. SAMPLE CONVERSIONS I • Example 1: How many meters are in 1 kilometer? There are 3 steps in the down-to-the-right direction between kilo- and the base (meter), so move the decimal point three places to the right, therefore there are 1000 meters in 1 kilometer! Back to Metrics Conversions

  12. SAMPLE CONVERSIONS II • Example 2: How many dekaliters are there in 2345 milliliters? There are 4 steps in the up-to-the-left direction between milli- and deka-, move the decimal point four places to the left, therefore there are 0.2345 dekaliters in 2345 milliliters! Back to Metric Conversions

  13. 1. 11 cm = _____ mm 2. 0.55 m = _____ cm 3. 1.23 kg = _____ mg 4. 0.47 L = _____ hL 5. 1001 g = _____ kg 6. 357 mL = _____ daL 7. 131 dm = _____ km 8. 2001 kL = _____ mL Answer these before going to the next slide PRACTICE CONVERTING

  14. PRACTICE CONVERTING (ANSWERS) 1. 11 cm = 110 mm 2. 0.55 m = 55 cm 3. 1.23 kg = 1,230,000 mg 4. 0.47 L = 0.0047 hL 5. 1001 g = 1.001 kg 6. 357 mL = 0.0357 daL 7. 131 dm = 0.0131 km 8. 2001 kL = 2,001,000,000 mL • How did you do?

  15. MEASUREMENT MASS (LARGER) TIME TEMPERATURE DENSITY VELOCITY FORCE PRESSURE ENERGY POWER ELECTRICAL CURRENT STANDARD METRIC TON SECOND DEGREE CELSIUS KG PER CUBIC METER KM PER HOUR NEWTON KILOPASCAL KILOJOULE WATT AMPERE OTHER SI STANDARDS

  16. REFERENCES FOR THE “METRIC SYSTEM” • Clip art images courtesy of Microsoft Office 2002 • The U.S. Metric Association, http://lamar.colostate.edu/~hillger/ • Padilla, Michael J., Ph.D., Physical Science. Needham, Massachusetts: Prentice-Hall, 2001.

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