Units of Measurement

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Chapter 1 :

Chapter 1 Measurements Units of Measurement

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:

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:

Some Tools for Measurement

Learning Check :

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

Solution :

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:

Measurement in Chemistry In chemistry we do experiments measure quantities use numbers to report measurements

Learning Check :

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 :

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):

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:

Units in the Metric System length meter m volume liter L mass gram g temperature Celsius °C

Stating a Measurement:

Stating a Measurement In every measurement there is a Number followed by a Unit from measuring device

Learning Check :

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 :

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

Learning Check :

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 :

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 