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Chapter 1 Measurements Units of Measurement

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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?

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Standards of Measurement When we measure, we use a measuring tool to compare some dimension of an object to a standard.

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Some Tools for Measurement

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Learning Check From the previous slide, state the tool (s) you would use to measure A. temperature____________________ B. volume ____________________ ____________________ C. time____________________ D. weight____________________

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Solution 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 do experiments measure quantities use numbers to report measurements

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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

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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

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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 from measuring device

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Learning Check What is the unit of measurement in each of the following examples? A. The patients 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.

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Solution A. °F (degrees Fahrenheit) B. lbs (pounds) C. miles D. L (liters)

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Learning Check Identify the measurement in metric units. A. Johns height is 1) 1.5 yards2) 6 feet3) 2 meters B. The volume of saline in the IV bottle is 1) 1 liters2) 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 A. Johns 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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