We had a very fun science lesson today, we were trying to find out if gases weigh anything. We tested this by weighing a balloon and then we inflated the balloon and we weighed it again and it was 1g heavier. We then investigated if carbon dioxide weighs anything. Each group had a bottle of lemonade. We weighed the bottle and recorded the weight. After that we took it in turn to shake the bottle and we let it settle, we then opened the lid and allowed some of the gas to escape. We then weighed the bottle again and it was lighter. Both of these investigations prove that gases do weigh something.