David Webb went to our class this week to show us his vacuum. It wasn't a vacuum for cleaning things but it showed us pressure and how it can change different things at different pressures. I learned a lot of about pressure because we were able to visually see all the different things at higher levels of pressure. It was cool to see how the marshmallow started to expand and get bigger but after he released the pressure, the marshmallow shrunk and it was basically deflated and didn't have any of its air left. Brandon gave some of the marshmallow to me and it was very chewy so it wasn't like a regular marshmallow which made it kind of disgusting but it still tasted the same. Overall, the presentation was very good and i wish that he could present more things to us.
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