Explains how to answer questions about the amount of something by measuring volume; describes the development of standard measurement and the metric system; and introduces the main units in the customary system and measuring solids.
Readers learn what temperature is and why and how it is measured. They learn about the Celsius and Fahrenheit scales and where each is used. Readers learn about thermometers and how they help us in everyday life--from taking body temperatures to regulating how cool or warm our homes are.
A calendar can help people to count how long it is until their birthday. Calendars measure days, weeks, months, and years. Learn about different types of calendars and the history of measuring days, weeks, months, and years in "Calendar".
Simple text and photographs introduce clocks, including the different types and the history of measuring seconds, minutes, and hours. Includes online content that contains weblinks, audio and video clips, activities, and other features.
Explains what air is, discusses how it moves, its power to lift, carry smell and sounds, and cause storms, and how it is used by plants, animals, and people.
