1 Using Numbers in Science AND Metric System

2 Parts of a Measurement 1.The value (numerical portion) 2.The unit (describes what units) 3.The name of substance being measured EX: 1 teaspoon salt 2 liters of pop

3 The Metric System & Scientific Measurements made in metric units Referred to as the International System or SI units Based on the decimal system Related by powers of 10 Each type has a base unit Use prefixes to refer to a unit larger or smaller than the base by some power of 10

4 SI (International System) units Lengthmeterm Masskilogramkg TemperatureKelvinK TimesecondS VolumeLiterL Centigrade or Celsius = ⁰C This is the unit we will use in lab for temperatures!

Prefixes for Metric Units <1 deci (d) = 1/10 = 0.1 centi (c) = 1/100 = 0.01 milli (m) = 1/1000 = decimilli (dm) centimilli (cm) micro ( µ) = 1/ =

Prefixes for Metric Units >1 kilo (k) = 1000 hecto (h) = 100 deka (da) = 10 6

7 kilohectodecaBase Unit decicentimillimicro khdagram (g)dcmmμ liter (L) meter (m) Metric Unit Conversions

Millimeter Could be the diameter of a straight pin

9 Centimeter 1 inch = 2.54 centimeters Which is about the length of a sugar cube A paperclip could be about 2.54cm long

10 Meter

Kilometer

Mass 12

Mass 13

Volume 14

Volume 15

Class Activity 1 – Understanding Metric Units Part A - Matching A.Length B.Mass C.Temperature D.Time E. Volume (liquids) Part B – select the best prefix

Class Activity – Part C What are the correct abbreviations? 17 ____ milligram____ milliliter____ liter_____centimeter ____ kilogram____ millimeter____ kilometer____ gram ____ meter____ millisecond____ microgram_____ hectometer ____ micrometer____ microliter

Part D 18

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Review Questions 1. What does the prefix "milli" mean? A.millionth millionth B.thousandththousandth C.hundredthhundredth 2.A liter is a little more than a _______ A.pound pound B. gallon gallon C. quartquart 21

3. What is a good height for a basketball player? A. 6 meters6 meters B. 2 meters2 meters C. 6 millimeters6 millimeters 4. Which is the longer distance to run ? A. 50 meters 50 meters B. 50 kilometers 50 kilometers C. 50 miles50 miles 22

5. Which value would be right for the mass of a A. 17 mg B. 17 g C. 17 kg 6. Which value would be right for the mass of a A. 460 mg B. 460 g C. 460 kg

What units would best be used to record the length, volume or mass of these objects?