Our lung capacity investigation in Year 4

As we are learning about the human body, we completed an investigation to see if we could measure our lung capacity. We also investigated if physical activity could change our lung capacity.

We began by blowing into a balloon with just one exhale of breath. We measured the balloon with a partner and repeated this. We used this information to work out the volume of air that our lungs can hold.

We then repeated this activity of exhaling a breath into a balloon and measuring but first we had to run on the spot for 30 seconds. We did this 3 times and then we were exhausted!

We found that our lungs could hold more air when we were relaxed compared to after we had completed physical activity. We decided this was because when we are relaxed we can breathe in longer, bigger breaths. When we have done physical activity our lungs take in smaller breaths so that they can quickly get enough air into our bodies to send oxygen to our muscles where it’s needed.

We used this investigation as an opportunity to develop how we predict and interpret our results – we all made predictions about when our lungs could hold more air and even though we weren’t all right, we learnt that it’s ok to not be right when we predict as long as we learn something from our results.

We have really enjoyed the opportunity to explore so many different areas of science thanks to our topic and Science Week!