this week, david and jone webb came to visit.
they taught us about vacuums and air pressure.
the vacuum machine popped balloons, crushed soda cans, and made a chewy marshmallow.
this is how it works: if all the pressure and air molecules are removed from inside the can, the pressure from outside is still pushing it, so it crushes.
if pressure from outside is removed than the object will get bigger, like for the balloon and marshmallow , because air molecules inside are still pushing out.
their presentation really helped me out on understanding vacuums.
the electric and hand pump was real cool.
i want one.
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