We caught up with Larch class this afternoon as they took part in an experiment to measure gases in a balloon. The children were tasked with identifying a gas; in this case, Carbon Dioxide. They were also tasked with explaining what some gases are and their uses. For example, Carbon Dioxide is used to carbonate fizzy drinks. Basically what makes them fizzy.
The experiment showed the class that if you weigh a bottle of pop initially, then shake up the bottle allowing the gas to escape, the weight will be less as the gas also carries mass or weight. We also demonstrated this by initially weighing a deflated balloon and then blowing it up and re-weighing it. The balloon was heavier with the addition of gas; in this case, Carbon Dioxide gas exhaled from our own lungs.