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beam balanceclick to hear

Compares the mass of a body with that of another body of known mass (weight); when two pans hanging from a bar (beam) are in balance, the two weights are equal.
beam balance pan beam weight

pan click to hear

Flat rigid support that holds either the body to be weighed or the weights.

beam click to hear

Horizontal metal bar that balances on a vertical axis and has pans hanging from each end.

weight click to hear

Piece of metal, such as copper or iron, of known mass that is placed on a pan to balance the scale and thereby assess the corresponding mass of a body.