Presentation on theme: "The Metric System and Simple Metric Conversions"— Presentation transcript:
1 The Metric System and Simple Metric Conversions 8th Grade Earth and Space ScienceMrs. Liberatore
2 Why Use the Metric System? Scientists need to understand each other.Creates a consistent form of measurement.Everywhere in the world (except the U.S.) uses the metric system.
3 The Metric SystemAlso called the “SI System” – International System of UnitsBased on 10’sPrefixes change the size of the unitThere is a base unit for each typeof measurement.
4 Base Units and Important Prefixes Length – meters (m)Area – square meters (m2)Mass – grams (g)Weight – Newtons (N)Liquid volume – liters (L)Density – grams per cubic centimeter (g/cm3) or grams per milliliter (g/mL)Time – seconds (s)Temperature – Celsius (C) or Kelvin (K)Prefixes:Kilo (K) – x1000Centi (c) – x 0.01 or 1/100Milli (m) – x or 1/1000See the “Metric Toolbox” or Page 15 of your textbook for more
5 Factor Label Method Write what you know on the left Write what you want on the rightPut a conversion factor in the middleCancel units on top and bottomMultiply top and divide bottom(Or – move decimal to right if on topmove decimal to left if on bottom )
7 Do These On Your Own:How many cm in 2.4 m?How many mg in 65.5 cg?
8 The Ladder StrategyYou can also convert between units by moving the decimal point.Warning! This will work when you are converting between two of the same measurements but not when you are converting between two different measurements!
10 Measuring Distance SI unit of length is the meter A meter stick is 1 m long.The numbered lines are cm; the very small lines are mm.mmcm
11 Measuring Mass Digital balances will be used to measure mass. It will be in either grams or kilograms.
12 Measuring VolumeBeakers, flasks, and graduated cylinders are marked in mL.Measure from the bottom upward and estimate when necessary.
13 Lab Safety Concerns Walk carefully around the room Handle all equipment with carePatiently wait your turn at stationsIf lab equipment breaks – notify Mrs. Liberatore immediately! DO NOT TOUCH BROKEN EQUIPMENT.Meter sticks ≠ Swords, Light Sabers, etc….