Units of measurement
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Units of measurement

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Units of measurement Units of measurement Presentation Transcript

  • Chapter 1 Measurements Units of Measurement
  • Measurement
    • You are making a measurement when you
    • Check you weight
    • Read your watch
    • Take your temperature
    • Weigh a cantaloupe
    • What kinds of measurements did you make today?
  • Standards of Measurement
    • When we measure, we use a measuring tool to compare some dimension of an object to a standard.
  • Some Tools for Measurement
  • Learning Check
    • From the previous slide, state the tool (s) you would use to measure
    • A . temperature ____________________
    • B . volume ____________________
    • ____________________
    • C. time ____________________
    • D. weight ____________________
  • Solution
    • From the previous slide, state the tool (s) you would use to measure
    • A . temperature thermometer
    • B. volume measuring cup, graduated cylinder
    • C. time watch
    • D . weight scale
  • Measurement in Chemistry
    • In chemistry we
    • do experiments
    • measure quantities
    • use numbers to report measurements
  • Learning Check
    • What are some U.S. units that are used to measure each of the following?
    • A. length
    • B. volume
    • C. weight
    • D. temperature
  • Solution
    • Some possible answers are
    • A. length inch, foot, yard, mile
    • B. volume cup, teaspoon, gallon, pint, quart
    • C. weight ounce, pound (lb), ton
    • D. temperature  F
  • Metric System (SI)
    • Is a decimal system based on 10
    • Used in most of the world
    • Used by scientists and hospitals
  • Units in the Metric System
    • length meter m
    • volume liter L
    • mass gram g
    • temperature Celsius °C
  • Stating a Measurement
    • In every measurement there is a
    • Number
    • followed by a
    • Unit from measuring device
  • Learning Check
    • What is the unit of measurement in each of the following examples?
    • A. The patient’s temperature is 102°F.
    • B. The sack holds 5 lbs of potatoes.
    • C. It is 8 miles from your house to school.
    • D. The bottle holds 2 L of orange soda.
  • Solution
    • A . °F (degrees Fahrenheit)
    • B. lbs (pounds)
    • C. miles
    • D. L (liters)
  • Learning Check
    • Identify the measurement in metric units.
    • A. John’s height is
    • 1) 1.5 yards 2) 6 feet 3) 2 meters
    • B. The volume of saline in the IV bottle is
    • 1) 1 liters 2) 1 quart 3) 2 pints
    • C. The mass of a lemon is
    • 1) 12 ounces 2) 145 grams 3) 0.6 pounds
  • Solution
    • A. John’s height is
    • 3) 2 meters
    • B. The volume of saline in the IV bottle is
    • 1) 1 liter
    • C. The mass of a lemon is
    • 2) 145 grams