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Gravedad specifies

The relative density is defined as the ratio between the density of a substance and another substance taken as a reference, resulting ρr
where is the relative density, ρ is the density and the density ρ0 substance.

For liquids and solids, density is the usual reference of liquid water at a pressure of 1 atm and temperature of 4 ° C. Under these conditions, the density of water is 1000 kg/m3, ie 1 kg / L.

For gases, standard reference density of air is the pressure of 1 atm and temperature of 0 ° C.
can also calculate or measure the relative density as the ratio between the weights or masses of identical volumes of the substance and the substance. Franco Andres Rojas

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Polipastos

Called at full speed hoist used to lift or move a load with large mechanical advantage, because you need to apply a force much less than the weight to be moved, carried two or more pulleys to minimize the effort.

usually be subject to a rotating arm that is attached to a machine and vary in size or power lifting, small maneobran hand is the largest typically accompanied by an electric motor.

Andres Rojas Franco