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Veritasium
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These resources have been reviewed and selected by STEM Learning’s team of education specialists for factual accuracy and relevance to teaching STEM subjects in UK schools.
Are you lightest in the morning?
This video asks the question, “When are you lightest?”. Most people state that this is in the morning. An experiment is conducted to find out. This shows that there is a loss in mass in the morning. The question is then, “How does the body loose this mass?”. The answer is a combination of water loss and the fact that although we breathe in oxygen we breathe out carbon dioxide. The carbon dioxide molecule has a greater mass than an oxygen molecule. It is all about respiration.
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