Mall Usborne Look Inside How Things Work

⭐size: 19.5cm*22cm
⭐pages: 14 pages/book
⭐package: 1 book
⭐fit for: children
⭐language: English

⭐ Have you ever thought about how cars roar across the road or planes rush into the sky ? From fire engines and submarines to dishwashers and vacuum cleaners , in this exciting project , this book tells you how all kinds of tools work. It is very suitable for children who like to play with machines and understand physics

Let’s look at the principle of hot-air balloon : when goingup , the pilot will ignite the fuel inside . Because the hot-air balloon is lighter than the outside air , it rises : When going down , the pilot pulls open the heat sink at the top to release the heat , and the balloon drops slowly