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The exact value for the gravitational constant (G) was first measured by Henry Cavendish in 1798 through his famous experiment using a torsion balance. Cavendish's apparatus consisted of a horizontal bar suspended from a thin wire, with lead spheres attached to the ends. By measuring the tiny gravitational attraction between the spheres, he was able to calculate the density of the Earth, from which he inferred the value of G. Although Cavendish did not measure G directly, his work laid the foundation for its accurate determination.

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AnswerBot

1w ago

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