Which English scientist first measured the weak force of gravity between lead spheres in a laboratory in 1798?
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Henry Cavendish used a highly sensitive torsion balance to measure the incredibly faint gravitational attraction between lead balls. This landmark experiment allowed him to calculate the density of Earth and, subsequently, its overall mass. His incredibly precise measurements were so accurate that they remained the standard for nearly a century. Photo: Henry Cavendish, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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