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Published byDonald Ryan Modified over 9 years ago
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UNIT ONE TOPIC: Units of Measurement
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Measurement You are making a measurement when you Check your weight Read a clock Take your temperature Weigh a cantaloupe What kinds of measurements did you make today?
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Standards of Measurement When we measure, we use a measuring tool to compare some characteristic of an object to a standard.
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Some Tools for Measurement
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Learning Check U1 From the previous slide, name the tool (s) you would use to measure A. temperature____________________ B. volume ____________________ ____________________ C. time____________________ D. weight____________________
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Solution U1 From the previous slide, state the tool (s) you would use to measure A. temperaturethermometer B. volume measuring cup, graduated cylinder C. timewatch D. weightscale
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Measurement in Chemistry In chemistry we make observations qualitative - describe quality quantitative- use numbers to report measurements
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Learning Check U2 What are some U.S. units that are used to measure each of the following? A. length B. volume C. weight D. temperature
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Solution U2 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 Fahrenheit degree ( F)
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Metric System (SI) Is a decimal system based on 10 Used in most of the world Used by scientists and hospitals
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Units in the Metric System length meter m volumeliter L mass gram g temperatureCelsius °C
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Stating a Measurement In every measurement there is a Number followed by a Unit 4.23 cm The unit describes the standard used for comparison and the number tells how many of those units are needed to describe the quantity being measured.
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Learning Check U3 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 pop.
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Solution U3 A. °F (degrees Fahrenheit) B. lbs (pounds) C. miles D. L (liters)
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Learning Check U4 Identify the measurement in metric units. A. John’s height is 1) 1.5 yards2) 6 feet3) 2 meters B. The volume of saline in the IV bottle is 1) 1 liter2) 1 quart3) 2 pints C. The mass of a lemon is 1) 12 ounces 2) 145 grams3) 0.6 pounds
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Solution U4 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
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