Last Two Days Experment

In the last 2 days we have been doing science at school the science was about  evaporation condensation water ice gas and the 3 states which is liquid solid and gases. The other day we learned about how the air can go into a bottle when you add baking soda and vinegar when we did add all the ingredients and put the balloon on the part where the lid goes and the the balloon had air in it and we never even blowed the balloon up the because the baking soda and the vinegar had gas in it.