Why is it said that the Cavendish balance is used to "weigh...

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Key Concepts

Gravitational Constant (G)

The gravitational constant, G, is a fundamental constant that quantifies the strength of the gravitational force between two objects. The Cavendish experiment uses the measured deflections from the balance to calculate G, and, with this value, scientists can use Newton's law of gravitation to infer the mass of the Earth by relating the observed laboratory-scale forces to the gravitational pull exerted by a planetary body.

Newton's Law of Universal Gravitation

Newton's law states that every pair of masses attracts each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. In the context of the Cavendish experiment, this law allows the conversion of the small measured forces into an estimate of the Earth's mass, thus leading to the idea of 'weighing the Earth'.

Cavendish Balance

The Cavendish balance is a highly sensitive torsion balance designed to measure small gravitational forces between masses. Originally developed by Henry Cavendish, it detects the minute deflections in a suspended rod caused by the attraction between nearby masses, allowing for precise measurements of gravitational force in a controlled laboratory setting.

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