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National Geographic Little Kids First Big Book of Why (National Geographic Little Kids First Big Books) Hardcover – Picture Book, May 10, 2011
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- Print length128 pages
- LanguageEnglish
- Grade levelPreschool - 2
- Lexile measureNC630L
- Dimensions10.25 x 0.5 x 10.25 inches
- PublisherNational Geographic Kids
- Publication dateMay 10, 2011
- ISBN-101426307934
- ISBN-13978-1426307935
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- Publisher : National Geographic Kids; 1st edition (May 10, 2011)
- Language : English
- Hardcover : 128 pages
- ISBN-10 : 1426307934
- ISBN-13 : 978-1426307935
- Reading age : 3 - 6 years, from customers
- Lexile measure : NC630L
- Grade level : Preschool - 2
- Item Weight : 1.72 pounds
- Dimensions : 10.25 x 0.5 x 10.25 inches
- Best Sellers Rank: #1,611 in Books (See Top 100 in Books)
- #1 in Children's Almanacs (Books)
- #2 in Children's Mystery & Wonders Books (Books)
- #112 in Reference (Books)
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Reviewed in the United States on October 30, 2022
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Wrong. And in fact this trips up most elementary science students and they got it wrong here. Helium balloons don't float because they are "lighter" they float because they are less dense. Less dense objects float on more dense objects. For instance, a tanker ship is made of metals that are on their own denser and heavier than water. But as a boat they float? Why? Because as an entire object it's less dense than water (hint: Ships are largely filled with ballast like air.
Similarly, planes fly IN AIR because the air under the wing is higher pressure (denser) than the air above the wing. Is air lighter than air?
On the same page they talk about how hot air is "lighter than cold air" which it isn't. Hot air is simply less dense than cold air.




Reviewed in the United Kingdom 🇬🇧 on January 18, 2022


