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  • That's because there are helium inside it.
  • Mom,why does the hot-air balloon can fly up to the sky?
  • Helium?
  • Exactly.Actually,we use hydrogen before to raise them up,but hydrogen has a higher falmmability than helium,it may easily cause explosion,so we now use helium to heaved the hot-air balloon because helium is non-flammable.
  • Good.Oh...it's time to go.Let's get back home to have a rest.
  • Oh,I got it.
  • That stinky smell is carbon dioxide.
  • Mom!Why the vehicles always give some stinky smell?It's really disgusting!
  • Carbon dioxide is a form of carbon and oxygen.
  • Carbon Dioxide?What's that?
  • Um...carbon does not dissolve in or react with water or acids.
  • I still can't get it.Is there any example?
  • Never mind.So,let's get back home and have an afternoon tea.
  • Oh,I got it.Thanks Mom.
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