Why did balloons get bigger when the pump was turned on? What was happening at the molecular level?
The balloons got bigger because there was pressure going into the container from the pump. The pressure was taking air out of the container and the air had to go somewhere, so it went towards the balloons. It wasn't going too fast, so the temperate was probabaly at room level. The molecules are bouncing on the surface of the ballon, and this makes it stiff on the balloon in order to inflate the molecules for air pressure.
The molecular levels were repelling one another because there is so little space in the container that they repel one another, and the molecules are being pushed out of the container. The air is always moving.
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