What Floats What Sinks A Look at Density (Lightning Bolt Books)

34 Pages·2010·24.182 MB·English

by  Jennifer Boothroyd

Jennifer Boothroyd
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Lerner Publications Company
Minneapolis
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Copyright 2011 by Lerner Publishing Group, Inc.
©
All rights reserved. International copyright secured. No part of this book may be reproduced,
stored in a retrieval system, or transmitted in any form or by any means—electronic, mechanical,
photocopying, recording, or otherwise—without the prior written permission of Lerner Publishing
Group, Inc., except for the inclusion of brief quotations in an acknowledged review.
Lerner Publications Company
A division of Lerner Publishing Group, Inc.
241 First Avenue North
Minneapolis, MN 55401 U.S.A.
Website address: www.lernerbooks.com
Library of Congress Cataloging-in-Publication Data
Boothroyd, Jennifer, 1972–
What floats? What sinks?: a look at density / by Jennifer Boothroyd.
p. cm. — (Lightning bolt booksTM—Exploring Physical Science)
Includes index.
ISBN 978–0–7613–5433–8 (lib. bdg. : alk. paper)
1. FloatiTngO b oCdOiesM—EJuvenile literature. 2. Liquids—Density—Juvenile literature.
3. Archimedes' principle—Juvenile literature. I. Title.
QC147.5.B66 2011
532'.25—dc22 2009048347
Manufactured in the United States of America
1 — BP — 7/15/10
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An object floats when it rests on
top of a liquid or when it rises
in the air. Apples float in water.
Hot air balloons float in the air.
Kids wash apples
in a metal washtub.
Notice that the
apples are floating.
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An object sinks when it
drops down in liquid or
when it falls down
through the air. Rocks
sink in water.
Rocks would
also sink in air.
These pebbles can’t float
in water. They couldn’t
float in air either.
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Solid objects are not the only
things that float and sink.
Liquids and gases do too.
A bubble is a liquid with gas
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inside it. Bubbles float.
Corn oil and syrup are both
liquids. Corn oil floats in syrup.
Do you see the corn oil
floating on the surface
of this syrup?
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The sauce sinks
in milk.
If you’ve ever
poured chocolate
sauce into milk,
then you know that
the sauce will sink.
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g a s .

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The air in our
environment
Air is made of
is made up of
many gases. many gases.
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