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Science – Gases

In Year 4, we are learning about solids, liquids and gases. We thought about whether gases really weigh anything. Some people thought not because they are invisible or lighter than air. We did an experiment with fizzy water to find out.

First we weighed some fizzy water in a cup, then we stirred it to make the gas come out and weighed it again. The second time, it weighed less, showing that the gas that had escaped really weighed something (about 0.4 grams). We also used some even more sensitive scales and we could watch the weight going down as the bubbles escaped by themselves.