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  • Tomorrow, is April Fools, we should pull a prank on Liz. Any ideas?
  • Maybe one... But we're gonna need some help.
  • Hey! You know it's Avogadro! Alright, what do you need?
  • Hey uncle Avocado, we need you're help for a prank we're pulling. 
  • How does that  work?
  • We want to pull an April Fools prank. We want to fill one balloon with helium and one with air and then challenge our friend Liz to a game of "who can keep their balloon from floating away", she'll have the helium one and we'll have the air one. 
  • Hey Liz, you wanna play "keep the balloon from floating away"? 
  • Well, actually, you put in the exact same amount of gas molecules in each balloon. 
  • We need to know how to make the balloons look identical, we aren't sure how much helium and air to put each balloon what with them being different gases.
  • Well, funny you should ask, it works because of a law my ancestor developed, it's called Avogadro's Law. When pressure and temperature are kept the constant, all gasses with the same volume will contain the same amount of molecules. See, as you fill up you're balloon with more molecules, in order to keep the pressure the same as outside the balloon, the volume expands so that the molecules hit the edges of the balloon less which keeps the pressure the same. All gasses fill up the same volume with same number of molecules at constant temperature and pressure, so, to achieve the same volume in both balloons, you have to fill them with the same amount of molecules. 
  • The next day.
  • Okay!
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