What Is Density?

出版者:Scholastic Library Pub

作者:Barkan, Joanne

页数:32

出版时间:2006-9

价格:$ 5.59

装帧:Pap

isbn号码:9780516246604

What do a softball, a popcorn ball, and a birthday party balloon have in common? They all are made of matter and take up space. Is What Is Density? young readers will find out why the baseball is heavier than the popcorn ball and why they'd better hold on to the string of that balloon