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Ch02b using si units
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Ch02b using si units

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Transcript

  • 1. Unit 1
    Using SI Units
  • 2. Measurement Standard
    An exact quantity that people agree to use for comparison.
    * helps you get the same answer as other people
  • 3. What was used as the earliest measurement standards?
    Body Parts
    * The question then, is WHO’S body parts?
    The KING’S or QUEEN’S
  • 4. Is your hand or a body part a good standard of measurement?
    * no
    * people’s hands are not the same size
    * get different answers
  • 5. In order for any measurement to MAKE SENSE; two things must be included.
    1.) a number
    2.) a unit
  • 6. Every type of measurement has a base or central unit.
    * meter (distance or length)
    * liter (volume)
    * gram (mass)
    * second (time)
  • 7. Adding a prefix to a base (central) unit, you can create a whole new unit to measure any object.
  • 8. Prefixes Used When Measuring:
    Large Objects
    kilo = 103
    hecto = 102
    deka = 101
    Small Objects
    deci = 10-1
    centi = 10-2
    milli = 10-3
  • 9. Measurements that can be made
    Length
    Mass
    Temperature
    Time
    Area
    Volume
    Density
    Weight
  • 10. Length
    The distance between two points.
    Base (central) units of length
    * (US) FOOT [ft]
    * (SI) METER [m]
  • 11. Length
    Length of an object or the distance between two points is measured using a METERSTICK.
  • 12. Mass
    “A body of coherent matter.”
    * a collection of stuff joined to form an object
    Base (central) units of mass
    * (US) SLUG [slug]
    * (SI) KILOGRAM [kg]
    sometimes gram [g]
  • 13. Mass
    Mass is measured using a BALANCE.
  • 14. Temperature
    Measurement of how hot or cold something is.
  • 15. Temperature
    Base (central) units of temperature
    * (US) FAHRENHEIT [oF]
    * (SI) CELCIUS [oC]
    > (SI) KELVIN [K]
    * this is an absolute scale
  • 16. Temperature
    Temperature is measured using a THERMOMETER.
  • 17. Absolute Zero
    The coldest possible temperature.
    * temperature where ALL motion stops
    * 0 Kelvin
    * found by the formula:
    K = oC + 273.16
  • 18. Time
    Interval between two events.
    Base (central) units of time
    * (US) SECOND [s]
    * (SI) SECOND [s]
  • 19. Time
    Time can be measured using a CLOCK or a CALENDAR.
  • 20. Derived Units
    Obtained by combining multiple units of measurement.
  • 21. Area
    The amount of surface included in a set of boundaries.
    Found by the formula:
    * Area = lengthx width
  • 22. Area
    What is the difference between length and width?
    DIRECTION
  • 23. Area
    Base units of area
    * (US) FEET SQUARED [ft2]
    * (SI) METERS SQUARED[m2]
  • 24. Volume
    The amount of space an object occupies.
    Easy with liquids & gases, harder with solids
    * for a solid you may need the formula:
    volume = l x w x h
  • 25. Volume
    For a liquid or a gas all you need is a devise that is designed to measure volume.
    * a beaker, a flask or a graduated cylinder
  • 26. Volume
    Base (central) units of volume
    * (US) GALLON [gal]
    * (SI) LITER [L]
    sometimes centimeters cubed [cm3]
  • 27. Volume
    1 milliliter equals
    1 centimeter cubed.
    * 1 mL = 1 cm3
  • 28. Density
    The measurement of how thick, compact and solid an object is.
    Relationship between the mass & volume of an object
  • 29. Density
    Found by the formula:
    * Density = mass ÷ volume
    Expressed in g/Lorg/cm3
    * a mass unit / a volume unit
  • 30. Weight
    Measurement of the force of gravity pulling on the mass of an object.
    Changes as gravity changes.
    Base units of weight
    * (US) POUND [lb]
    * (SI) NEWTON [N]
  • 31. Weight
    Weight is measured using a SPRING SCALE.
  • 32. MASS and WEIGHT are NOT the same thing!
  • 33. Physical Properties
    Characteristics of a substance that can be used to identify it.
    Color
    Shape
    Texture
    State of matter
    Size
    All measurements
    (changing a physical property does NOT change the substance)
  • 34. The End