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I'm so happy that I was able to get a balloon today! I'm going to go to my friends house to show her!
Why did my balloon deflate? I'll go to my teacher and ask her.
When you were inside your house the temperature was higher and therefore the particles moved faster in the balloon and bumped into each other more often and harder. But when you went outside the air was much colder so the particles moved slowly and bumped into each other less. The faster the particles move and bump around, the more pressure there is in the balloon and the air inside it takes up more space and has a higher volume.
(Explains what happened.) Why did my balloon deflate when I went outside?
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