Chapter 1
MEASUREMENT
Chapter 1 is important because all quantitative knowledge about our physical environment is
based on measurement. Some chapter sections have been reorganized and rewritten for clarity.
The 1.2 Section, ―Scientific Investigation,‖ introduces the student to the procedures for scientific
investigation. Major terms such as experiment, law, hypothesis, theory and scientific method are
introduced. The idea that physical science deals with quantitative knowledge should be stressed.
It is not enough to know that a car is going ―fast‖; it is necessary to know how fast.
A good understanding of units is of the utmost importance, particularly with the metricBritish use in the United States today. The metric SI is introduced and explained. Both the metric
and the British systems are used in the book in the early chapters for familiarity. The instructor
may decide to do examples primarily in the metric system, but the student should get some
practice in converting between the systems. This provides knowledge of the comparative size of
similar units in the different systems and makes the student feel comfortable using what may be
unfamiliar metric units. The Highlight, ―Is Unit Conversion Important? It Sure Is,‖ illustrates the
importance of unit conversion.
The general theme of the chapter and the textbook is the students’ position in his or her
physical world. Show the students that they know about their environment and themselves
through measurements. Measurements are involved in the answers to such questions as, How old
are you? How much do you weigh? How tall are you? What is the normal body temperature?
How much money do you have? These and many other technical questions are resolved or
answered by measurements and quantitative analyses.
DEMONSTRATIONS
Have a meter stick, a yardstick, a timer, one or more kilogram masses, a one-liter beaker or a liter
soda container, a one-quart container, and a balance or scales available on the instructor’s desk.
Demonstrate the comparative units. The meter stick can be compared to the yardstick to show the
difference between them, along with the subunits of inches and centimeters. The liter and quart
also can be compared. Pass the kilogram mass around the classroom so that students can get some
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