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The stone is a unit of mass commonly used in the United Kingdom and Ireland. It is equal to 14 pounds or approximately 6.35029 kilograms. Stones are used for measuring the mass of people, particularly in discussions of body weight or in medical contexts.
The kilogram is the base unit of mass in the International System of Units (SI). It is defined as the mass of the international prototype of the kilogram, a platinum-iridium alloy cylinder kept at the International Bureau of Weights and Measures in France. Kilograms are commonly used for measuring larger quantities of mass, such as the mass of people, animals, or objects.