If an object's weight was equivalent to 1728 carob seeds, then the object was said to weigh one Roman pound.

It appeared in Newton's 1728 book A Treatise of the System of the World.

The kilogram is 1000 grams (g), and was first defined in 1795 as the mass of one cubic decimetre of water at the melting point of ice.

Newton's books on universal gravitation were published in the 1680s, but the first successful measurement of the Earth's mass in terms of traditional mass units, the Cavendish experiment, did not occur until 1797, over a hundred years later.

Increasingly precise experiments have been performed, such as those performed by Loránd Eötvös, using the torsion balance pendulum, in 1889.

Repeated experiments since the 17th century have demonstrated that inertial and gravitational mass are identical; since 1915, this observation has been incorporated a priori in the equivalence principle of general relativity. == Units of mass == The International System of Units (SI) unit of mass is the kilogram (kg).

The re-definition of the kilogram and several other units came into effect on 20 May 2019, following a final vote by the CGPM in November 2018.

The re-definition of the kilogram and several other units came into effect on 20 May 2019, following a final vote by the CGPM in November 2018.

Poincaré termed this to be an "insurmountable flaw" in the Mach definition of mass. == Atomic masses == Typically, the mass of objects is measured in terms of the kilogram, which since 2019 is defined in terms of fundamental constants of nature.

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