STEM Challenge: Think like a Scientist

Project Discipline: STEM
​Ages: All ages
Difficulty level:​ Easy
Supplies: A plastic liter bottle, a couple of quarters, some water and a freezer!

Today we'd like you to follow a set of steps to make a plastic bottle burp, and then use your brains to figure out how it happened!  

• First, put an empty plastic liter bottle into the freezer, and keep it in there for at least 1 hour (a few hours would be even better).
• After you've waited, put a couple of quarters into a little dish of water.
• Remove your plastic bottle from the freezer and quickly place the quarter over the top of the bottle. 
• Wait and watch!  As your bottle burps, the quarter will move.  After each burp, readjust the quarter to close the seal again.  Count how many times your bottle burps! 

​How does this work?  Think about it first, and come up with your own conclusions, then take a peak at how Marla's project turned out this week, and what she has to say about how it works!

Be sure to share your results with us on the Alaska 4-H facebook page!