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Bang Goes the Theory presenter, Dr Yan, demonstrates how breathing through a very long tube is difficult underwater. Using a sealed plastic bottle and an open plastic bottle with a long tube attached, the effect of water pressure is demonstrated at a depth of about one metre. This shows what happens to a person's lungs as they dive. The ideas are extended by discussing the unique physiology of elephants which allow them to breath at a significant depth underwater using their trunk as a snorkel.
Use as a plenary to give an alternative situation where the effect of water pressure and depth is seen.
Clip 9 from the Bang Goes the Theory teachers pack. To download the pdf please go to bbc.co.uk/schools/teachers/bang/.
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