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Scientific Measurements

Scientific Measurements. The metric system. Metric Prefixes. Kilo = 1000 Hecto = 100 Deka = 10 Deci = 1/10 Centi = 1/100 Milli = 1/1000. Meters, Liters, Grams. Meters measure length Liters measure volume Grams measure mass. How Big?. A meter is about 39 inches

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Scientific Measurements

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  1. Scientific Measurements The metric system

  2. Metric Prefixes Kilo = 1000 Hecto = 100 Deka = 10 Deci = 1/10 Centi = 1/100 Milli = 1/1000

  3. Meters, Liters, Grams • Meters measure length • Liters measure volume • Grams measure mass

  4. How Big? • A meter is about 39 inches • A kilometer is 0.6 mile • A centimeter is about the width of your little finger • A gram is about the mass of a paper clip • A kilogram is 2.2 pounds • You drink 2 liters of pop

  5. Other metric units • Temperature is measured in degrees celsius or centigrade • Heat/energy is measured in calories or joules • Weight is measured in Newtons • Mega = 1,ooo,ooo • Micro = one millionth • Nano = one billionth

  6. K H D O D C M • Changing from one metric unit to another is called metric conversion • “O” is the space where meter, liter, or gram (the “base unit”) belongs • Kids Have Dropped Over Dead Converting Metrics • Let’s practice!

  7. K H D O D C M • To change from one metric unit to another, we simply move the decimal point. • For example: • 25.4 km = _____________ cm? • K-H-D-O-D-C is 5 places to the right • 25.4 km = 2,540,000 cm

  8. K H D O D C M • 30 cm = ___________hm • C – D- O –D- H is 4 places to the left • 30 cm = 0.0030 hm • (this is the same as 0.003 hm) • 14 dkl = _____dl • D- O –D is 2 places to the right • 14 dal = 1400 dl

  9. One cubic centimeter = one milliliter Using water displacement, how many milliliters do you expect the water to raise when the cube is lowered? This cube’s sides are each 3 cm. What is the volume of the cube? 27 cubic cm 27 ml

  10. Measuring volume of a solid by water displacement

  11. Graduated cylinder measurement • Volume is measured using a graduated cylinder. • When reading a graduated cylinder, read the bottom of the meniscus.

  12. Measuring water • If you wanted to measure 25ml of water, what instrument would you use?

  13. Measuring water 2 • If you wanted to measure 25 grams of water, what 2 instruments could you use?

  14. Density of Water • One milliliter of water • Has a mass of 1 gram • Density = Mass ÷ Volume • Calculate the density of water 1g ÷ 1ml = 1g/ml

  15. Scientific notation • Rules: 1 digit before the decimal point Multiply the number by a power of 10 • Example: Write 34,000 in scientific notation. • Solution: 3.4 x 104

  16. Write the following in scientific notation: 4.1 x 106 • 4,100,000 = _______________ • 345,600,000,000 = _________ • 0.0456= ________________ • 0.00000012=____________ • O.00305= ____________ 3.456 x 1011 4.56 x 10-2 1.2 x 10-7 3.05 x 10-3

  17. Write the following in standard form: 4670 • 4.67 x 103 =__________________ • 3.112 x 105 = _________________ • 3.112 x 10-4 = ________________ • 4 x 10-6 = ___________________ • 1 x 1011 = __________________ 311200 0.0003112 0.000004 100,000,000,000

  18. That’s all folks! • Time to try some on your worksheets!

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