Why did the balloons get bigger when the pump was turned on?
The balloons moves molecules out of the container and they interact causing the balloons to get bigger.
Taking molecules from outside the balloon away.
Temperature: A thermometer is a spedometer. They both measure rate of motion. Heat causes motion.
Liquid nitrogen makes a balloon shrink. As the balloon warms up in the air it expands. The moisture from the breath in the balloon creates liquid when placed in liquid nitrogen.
What was happening at the molecular level?
The pump was moving molecules out of the container. Chemicals came together and lost their energy. The containers pump molecules out of the container. Gas molecules move and are far apart. Molecules in the balloon are moving and bouncing around and the bouncing is the stiffness of the balloon. Air molecules are outside that are bouncing and the inside onse are bouncing so it stays the same size but if the bouncing ones on the outside are taken away the balloon size increases because they are only bouncing on the inside.
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