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metal prints pan metal prints beaker metal prints beakers metal prints beam metal prints chemical metal prints encased metal prints enclosed metal prints equilibrium metal prints lever metal prints mass metal prints measurement metal prints physical metal prints pivot metal prints scales metal prints single metal prints

photographs pan photos beaker photos beakers photos beam photos chemical photos encased photos enclosed photos equilibrium photos lever photos mass photos measurement photos physical photos pivot photos scales photos single photos

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Balance in a case. A balance measuring the weight of two glass beakers. Balances are used to measure the weight, and therefore mass, of a substance or object. Balances such as the one shown consist of a pivoted horizontal lever (beam, top), with a weighing pan (scale) suspended from each arm (left and right). The unknown mass is placed in one pan, and known masses are added to the other pan until the beam is as level as possible (equilibrium). When the beam is level the weight of the two masses in each pan is the same. This balance is inside a case to prevent air currents from moving the pans and affecting the results.

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