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**Measurements Units of Measurement**

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. temperature thermometer B. volume measuring cup, graduated cylinder C. time watch D. weight scale

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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 A. length B. volume C. weight D. temperature**

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 volume liter L mass gram g temperature Celsius °C

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**In every measurement there is a Unit from measuring device**

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 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.

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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. 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

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**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

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