What did Airy measure about the Earth?
Mean density
Circumference
Volume
Surface area
Answer
Mean density is a measure of the average density of the Earth. It was first measured by George Biddell Airy in 1854. Airy used a method called the Cavendish experiment, which measures the gravitational attraction between two objects. By measuring the gravitational attraction between the Earth and a known mass, Airy was able to calculate the Earth's mean density.
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