This video demonstrates how to determine the mass of the earth using some very simple equipment and a powerful mathematical expression. A century wide collaboration between Newton and Cavendish makes this possible. The video includes a discussion of Newton’s universal law of gravitation and Cavendish’s famous experiment that led to the determination of “G” the universal gravitational constant.
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As far as weight goes, Earth is a pretty hefty celestial body. But exactly how heavy? And how does one measure something so massive? Find out in this episode.

Whether the topic is popcorn or particle physics, you can count on the HowStuffWorks team to explore – and explain – the everyday science in the world around us on BrainStuff.

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