Introduction to Metric System - PowerPoint PPT Presentation

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Introduction to Metric System

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Title: Introduction to Metric System


1
Introduction to Metric System
2
The Metric Scale System
  • K H D S D C M
  • Kilo Hecto Deca Deci Centi
    Milli
  • (h) (da) (d)
    (c) (m)
  • grams
  • meters
  • liters
  • BIG SMALL

3
EASY WAY TO REMEMBER
  • King Henry Died Sunday Drinking Chocolate Milk

4
MASS
  • The amount of matter that is packed into an
    object.
  • Use grams to measure mass

5
GRAMS
  • The Symbol g
  • Measures non-liquids
  • Commonly used in cooking food labeling

6
What do we use to measure Grams?
  • We will use a Triple Beam Balance

7
How to use a Triple Beam Balance
  • 1. Zero the balance
  • 2. Slide all of the riders back to zero
  • 3. Check the pointer (pointing to zero)
  • 4. If necessary, use the adjustment screw to
    get back to zero
  • 5. Place the object on the pan and move the
    riders along the beams beginning with the largest
    mass first

8
How is mass different than weight?
  • WEIGHT Determined by the pull of gravity on an
    object
  • Note If you leave Earth
  • Your weight will change
  • Your mass will remain constant

9
LENGTH
  • The distance between two points
  • Use meters to measure length

10
METER
  • The Symbol m
  • Measures the distance between two points
  • Commonly used for lengths of races

11
What do we use to measure meters?
  • We will use rulers

12
ROUNDING
  • How long is this line? Round to the nearest
    centimeter.

3.0 cm
13
Nearest 10th of a centimeter
  • A centimeter is divided into 10 sections on a
    ruler

This value is 1.5 cm
14
How long is this line
  • Measure to the nearest 10th of a centimeter

3.3 cm
15
VOLUME
  • The amount of 3-D space an object occupies
  • Use liters to measure volume

16
Liter
  • The symbol L
  • Measures liquids
  • Commonly used for items that take up space in a
    container

17
What do we use to measure Liters?
  • We will use graduated cylinders and beakers

18
How to use a graduated cylinder
  • MENISCUS A curve in the surface of a liquid
  • ALWAYS read from the bottom of the meniscus

19
How to use a graduated cylinder
  • 1. Place graduated cylinder on flat surface
  • 2. Become eye level with the cylinder
  • 3. Find the bottom of the meniscus
  • 4. Record the Volume to the nearest 10th of a mL

20
Read the meniscus record the volume
21
Volume of objects
  • We learned how to find volume of liquids
  • Sometimes we want to know how much space
    non-liquids take up
  • How can we find the volume of non-liquid
    objects????

22
VOLUME of a REGULAR object
  • A regular object has even sides
  • We can easily use a ruler to measure

23
FORMULA
  • Volume length x width x height
  • V l x w x h
  • Units cm x cm x cm cm3

24
Practice Regular Object 1
  • Find the volume

Height 4.0 cm
Width 3.0 cm
Length 10.0 cm
Formula Substitute Answer
25
VOLUME of an IRREGULAR object
  • An irregular object has un-even sides
  • We cannot easily use a ruler
  • Use a graduated cylinder

26
THE PROCESS
  • 1. Place water in graduated cylinder
  • 2. Find Meniscus record the volume (mL)
  • 3. Add object to the water
  • 4. Find the new volume record (mL)
  • 5. Subtract (END - START)

27
Practice Irregular Object 1
  • Find the volume

28
DENSITY
  • How tightly the matter in an object is packed
    together

29
Measuring Density
  • Formula Density Mass
  • Volume

30
Sink or Float
  • Density of water 1.0 g/cm3
  • Above 1.0 SINK
  • Below 1.0 FLOAT

31
Density of a Regular object
  • Mass 60.0 g
  • Volume 120.0 cm3
  • Calculate Density
  • Sink or Float?

32
Density of an Irregular Object
  • Mass 15.0 g
  • Volume 5.0 mL
  • Calculate Density
  • Sink or Float?
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