Module 1

Module 1: The International System of Units (SI)

Lesson Summary

Do you check your bill when you purchase groceries from a supermarket? Prices of items that are sold by weight, such as meats and vegetables, are listed per kilogram. As a careful shopper, you should be familiar with the SI units for mass.

In this lesson you explored these questions.

• How is mass measured in SI?
• What are the common units for measuring mass in SI?
• How is one unit used to describe a mass converted to another unit?

Check your level of understanding of the materials covered in this lesson by completing “Lesson 4 Traffic Lights.” If you select an amber or red traffic light in the multimedia piece, you will receive information about additional work you can complete to improve your understanding of the topics. Complete the suggested work before you proceed to the Lesson 4 Assignment. If you experience difficulty, contact your teacher before starting the Lesson 4 Assignment.

You discovered that the base unit for mass in SI is the kilogram, from which gram and tonne are derived. You examined the relationships among the gram, kilogram, and tonne. You discovered that to convert among these units, you just have to move the decimal to the left or right.

Assignment

Retrieve the Lesson 4 Assignment Booklet you saved in your course folder at the start of this lesson. Complete the Assignment Booklet. Resave your Assignment Booklet in your course folder and submit a copy to your teacher for assessment.

Unit Project

Before you move on to the next lesson, you should be close to completing the SI (metric) section of the Unit 1 Project.