Metric System Part 1
The Metric System Is a system of measurement. Is also known as the “S.I. System”. (System International)
Metric System Quantity Unit Unit Symbol Distance meter m Mass gram g Volume liter L Time second s Temperature degrees celsius o C
every student should know… Prefixes every student should know… Example Means.. Symbol Prefix milli- m thousandth mL centi- c hundredth cg kilo- k thousand km
graduated cylinder or beaker Tools of Measurement Tool Unit (unit symbol) Quantity Distance meter (m) meterstick or ruler Mass gram (g) balance Volume liter (L) graduated cylinder or beaker
WHY USE METRIC?
Benefits of the Metric System: It uses the decimal system (10’s!) It is an International Standard. The units relate to each other.* *(More on this later!)
kilo, centi, milli How do you do that? Be able to give your answer using any of these prefixes! For example: A snowboard is 1.85 m or 185 cm 1850 mm How do you do that?
Common Sense: Problem: How many centimeters is 1.5 meters? There are many ways to solve this problem. One way is Common Sense: 1. The Metric System prefixes work by multiples of 10. So, the answer must be found by just moving the decimal point. Some possible answers are: 15cm, 150 cm, 1500 cm, 0.15 cm, 0.015 cm 2. Which of these are reasonable answers?
Does the measurement make sense? 1cm = width of a fingernail 1 g = mass of a push pin 1 mL = ~20 drops of water
Practice Guessing: 1.5 m = 12 cm = 0.295 m = 0.8 m = 150 0.12 295 80
Metric System Part 2
Metric System Quantity Unit Unit Symbol Distance meter m Mass gram g Volume liter L
kilo, centi, milli How do you do that? Be able to give your answer using any of these prefixes! For example: A snowboard is 1.85 m or 185 cm 1850 mm How do you do that?
Practice Guessing: 1.5 m = 12 cm = 0.295 m = 0.8 m = 150 0.12 295 80
just meter, liter, or gram Metric Staircase. centi base kilo milli k - kilo Move up a step (left): …decimal moves left Move down a step (right): …Decimal moves right h - hecto da - deca base (no prefix) - just meter, liter, or gram d - deci c - centi m - milli
Practice 1500 cm = 0.012 m = 29,500 cm = 0.08 km = 15 12 0.295 8000 m
Does the measurement make sense? 1cm = width of a fingernail 1 g = mass of a push pin 1 mL = ~20 drops of water
Metric System Quantity Unit Unit Symbol Distance meter m Mass gram g Volume liter L
Mass is a measure of the amount of a substance. What is mass? Mass is a measure of the amount of a substance. Mass is not weight Mass is not “how much space something takes up”; (that’s what volume is!)
Mass versus Weight Your mass is the same everywhere in the universe Your weight is less on the moon than it is on earth, because weight depends on gravity. link
graduated cylinder or beaker Tools of Measurement Tool Unit (unit symbol) Quantity Distance meter (m) meterstick or ruler Mass gram (g) balance Volume liter (L) graduated cylinder or beaker
Practice Prefixes, Methods of Metric Conversion Prefixes are Universal cg,cm,cL, etc. Review Methods: Common sense Metric Staircase Introduce Method: Dimensional Analysis Practice with balances Practice with common sense conversion and then staircase conversion using grams and kilograms, etc.