WHAT is torsion balance?
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an instrument for measuring very weak forces by their effect upon a system of fine twisted wire
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torsion balance, instrument used to measure small forces. It is based on the principle that a wire or thread resists twisting with a force that is proportional to the stress. ... Torsion balances are used to measure small electric, magnetic, and gravitational forces. One type is used to measure small weights.
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