KDKA Ray Petelin’s Peeps Experiment

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PITTSBURGH (KDKA) — So, why does a Peep expand when you suck the air out of a jar?
The thing about air is that it likes to fill empty spaces, and you create an empty space with no air, what we call a vacuum, when the air is removed from the jar.
(Photo Credit: KDKA)
Since air is trapped inside marshmallows, or Peeps, during their production, these air pockets in the Peep expand, or push air outward, as they try to fill the vacuum created when the air is p