Can you blow up a balloon without you blowing it up with your mouth or a pump? Today we made wind in a plastic coca cola bottle.  

What we needed was two buckets one was full of cold water and one was full of hot water. We also needed two coke bottles and we had to put balloons on top of them. To keep the air in and to test the balloon. We also had a cooking spoon.

The coke bottle when it was in the cold bucket of water it was in a state of inertia. Inertia means no change at all. There was no heat so the particles could not get bigger so the balloon didn't get bigger.

After that we had to immerse the bottles in the water.We immersed the bottle because the water needed to be at least at the neek . Immerse means dip or submerge in a liquid.  With the hot water we the spoon to hold the bottle down so we did not burn ourselves. With the cold water we just held the bottle down because we could not burn ourselves.

After that we put the bottle in the cold water we had to observation. We waited and waited and still it did not do anything. But when we put the bottle in the hot water  the balloon blow up a bit. I think it did that because when the hot air was coming up it did not have anywhere to go so it went into the balloon.

All this happened because of the heated particles get bigger and bigger so they had to go into the balloon because that was the only place that could stretch which was the balloon. when the particles got  bigger the only place that could stretch was the balloon thats why the balloon blow up  

Now I hope you know what the answer is from my introduction is? Yes you can blow up a balloon without using your mouth or using a pump.

below on the next page is the diagram why don't you have a look.:)