Cold Air Balloon!

When baking soda and vinegar mix, it makes something called an endothermic reaction. This makes carbon dioxide bubbles that can inflate a balloon. It also lowers the air temperature in the ballon, making it colder. If you feel the bottom of the ballon it will be much more colder than it was before. This is very easy to do. And you can even go do it now, you should have the ingredients in your kitchen.

To do this experiment you will need:

A balloon

One cup of vinegar

One tablespoon of baking soda

One funnel

One bottle

First you put one tablespoon of baking soda inside of your balloon using a funnel. Next you put your funnel on top of your bottle and put your one cup of vinegar in. Remember to wipe any excess baking soda off the funnel. Next you stretch the balloon on top of the nozzle of the bottle trying not to get any baking soda into the vinegar. Then once the balloon is stretched over the nozzle of the bottle tightly you can poor the baking soda in. And ABRAKADABRA the balloon should start to fill up with carbon dioxide!

Part 2:

We did a way bigger version of this last Wednesday. We did 4 cups of vinegar and 8 tablespoons of baking soda. It was quite tricky to get the baking soda into the ballon so that was the first problem. Then we had to stretch the balloon over the big nozzle of the milk bottle. When we tipped the balloon over the baking soda dropped into the vinegar. The reaction cause carbon dioxide bubbles like it should do, but then the liquid went up into the balloon! By now the balloon was kinda breaking and the liquid was spraying out of the bottle. I went and felt the vinegar and it was really cold because of the endothermic reaction.

Part 3:

We did and even bigger version of the cold air ballon. We got a super pump water bottle and filled it up. We didn't even measure how much ingredients we used. We used a jumbo balloon so it will fill up with lots of air. It didn't pop but it got very very big. We filled the balloon and the bottle up to the brim and chucked them together and it instantly started to react with the endothermic. We felt the balloon and it felt very tight and cold. I hope that we may be able to do a part 4 with a bigger bottle and bigger ingredients.