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Chapter 1. Measurements Units of 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.

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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.

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 check8
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

solution9
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 check13
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.

solution14
Solution

A. °F (degrees Fahrenheit)

B. lbs (pounds)

C. miles

D. L (liters)

learning check15
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

solution16
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