Benjamin Proudfit - Why Do Ice Cubes Float?

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Table of Contents

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everyday mysteries

WHY DO ICE CUBES FLOAT?

Benjamin Proudfit

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everyday mysteries

why do ice cubes float?

By Benjamin Proudfit

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Please visit our website, www. garethstevens. com. For a free color catalog of all our high-quality books, call toll free 1-800-542-2595 or fax 1-877-542-2596.

Library of Congress Cataloging-in-Publication Data

Proudfit, Benjamin, author. Why do ice cubes float? / Benjamin Proudfit. pages cm. ( Everyday mysteries) Includes bibliographical references and index. ISBN 978-1-4824-3852-9 ( pbk. ) ISBN 978-1-4824-3853-6 ( pack) ISBN 978-1-4824-3854-3 ( library binding) Water Density Juvenile literature. Ice Juvenile literature. Floating bodies Juvenile literature. I. Title. II. Series: Everyday mysteries. GB2403. P76 2016 dc23 2015033709

Published in 2016 by Gareth Stevens Publishing East 14th Street, Suite New York, NY 10003

Copyright 2016 Gareth Stevens Publishing

Designer: Katelyn E. Reynolds Editor: Kristen Nelson

Photo credits: Cover, p. successo images/Shutterstock. com; pp. ( background) Natutik/Shutterstock. com; p. Digital Media Pro/Shutterstock. com; p. Ewais/ Shutterstock. com; p. ( molecule) Anzhelika Pavlova/Shutterstock. com; p. ( water drops) Shutterwolf/Shutterstock. com; p. Kenneth Eward/BioGrafx/Science Source/ Getty Images; p. Serdar Tibet/Shutterstock. com; p. somchaij/Shutterstock. com; p. linling/Shutterstock. com; p. Konstantin Shishkin/Shutterstock. com.

All rights reserved. No part of this book may be reproduced in any form without permission in writing from the publisher, except by a reviewer.

Printed in the United States of America

CPSIA compliance information: Batch #CW16GS: For further information contact Gareth Stevens, New York, New York at 1-800-542-2595.

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Contents

Floating Question

Density

Molecule Talk

Light Ice

Solid to Liquid

Floating for a Reason

Melt and Boil

Glossary

For More Information

Index

Boldface words appear in the glossary

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Floating Question

When its hot outside, nothing is better than a cold glass of water. To make it stay cold longer, you can add ice! The ice floats near the top of the water. Why is that?

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Density

Ice is the solid form of water. Water freezes, or becomes ice, at 32F (0C). Ice floats in water because ice is less dense than water. Density is the measurement of how much matter is in a certain volume.

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Molecule Talk

The makeup of a water molecule makes ice less dense than liquid water. A water molecule is made from one oxygen atom and two hydrogen atoms. Theyre bonded, or connected, to each other.

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H2O (water)

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Water molecules bond to one another, too. These weaker bonds change at different temperatures. When water gets close to freezing, the bonds start to hold the molecules farther apart. This creates ice!

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Light Ice

Have you ever seen a frozen bottle of water? You can see for yourself that the ice takes up more space than liquid water. A certain volume of ice also weighs less than the same volume of water!

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When a rock is put into water, it sinks, and the water rises. The rock is denser than the water. Even though ice doesnt sink, it also displaces water. Thats why your glass might overflow when you add ice!

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Solid to Liquid

The solid form of most substances is denser than their liquid form. Water, though, reaches its most dense at about 40F (4.4C). At that temperature, water is still liquid!

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Floating for a Reason

A frozen pond isnt frozen all the way through! Ice has formed on top of the water. This stops the rest of the water from freezing, allowing fish and plants to live under the ice!

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