Science Experiments

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Question: Chemistry Gas experiment?

I dont know the name to this experiment, so I couldnt find any help online. Basically we used two glass beakers, one big and one small. We filled the big one up with a little bit of water, then flipped the small beaker upside down and put it inside the bigger beaker. We put color dye into the water and heated it on a hot plate. It started bubbling and releasing water vapor. After it boiled, we took it off the hot plate and onto the table. All the water outside the smaller beaker got sucked in, and all the water filled up in the small beaker and the outside bigger one was empty. What happened?? I dont understand it.

Answer: I have never seen this experiment, but from your observations I would say that as you heated the large beaker of water, the air in the small inverted beaker escaped in part, leaving a partial vacuum. When the beakers were removed from the heat, they obviously cooled, and the volume of the remaining air in the small inverted beaker got smaller, and the air that had escaped was replaced by water from the large beaker. Nature hates vacuums, and will fill them with any type of matter, in this case water.

Free 9th Grade Science and Chemistry Experiments Online Vid