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Kilogram

The kilogram (kg) is the base unit of mass in the International System of Units (SI). It is defined based on the Planck constant (h), a fundamental constant of nature.

1 kilogram is the mass that corresponds to the fixed numerical value of the Planck constant (h), which is 6.62607015 × 10⁻³⁴ joule-seconds (J·s), when expressed in the SI unit J·s = kg·m²·s⁻¹.

This modern definition ties the kilogram to a constant of nature rather than a physical object, ensuring its precision and stability over time.

Before this redefinition, the kilogram was defined as the mass of the International Prototype of the Kilogram (IPK), a physical platinum-iridium cylinder stored in France.

Origin:

The kilogram originated during the French Revolution in the late 18th century as part of the metric system's development. Initially, it was defined as the mass of one cubic decimeter of pure water at 4°C, chosen for its universal availability and consistency. In 1799, a physical standard called the Kilogram of the Archives, a platinum cylinder, was created to represent the unit. Later, in 1889, the International Prototype of the Kilogram (IPK), a more precise platinum-iridium cylinder, was adopted as the global standard, stored in France with copies distributed worldwide.

Over time, physical changes in the IPK led to inconsistencies, prompting scientists to redefine the kilogram. In 2019, it was redefined based on the Planck constant (h), a fundamental constant of nature, linking the kilogram to unchanging physical properties rather than a physical object. This modern definition ensures long-term precision and stability for the unit of mass.

Stone (US)

The stone (st) is a unit of mass traditionally used in the UK and Ireland, but in the United States, it is less common. In the U.S., the stone is defined as 14 pounds or approximately 6.35 kilograms. It is still used informally in some contexts, particularly in reference to body weight.

Origin:

The stone as a unit of mass has roots dating back to ancient times, where it was used in various cultures for weighing goods, with the weight of a stone varying by country and commodity. In the UK, the stone was historically used to measure items like wool, and the weight of the stone varied (ranging from 5 to 30 pounds) based on the goods being measured. The U.S. adopted a 14-pound stone in the 19th century, primarily as a way to measure body weight, though it is now largely replaced by the pound for more precise measurements. The 14-pound stone is still used informally in some areas, especially in the context of body weight.

Convert Kilogram to other weight-converter units

1 Kilogram = 1 Kilogram

1 Kilogram = 1000 Gram

1 Kilogram = 1000000 Milligram

1 Kilogram = 0.001 Metric Ton

1 Kilogram = 0.0009842073 Long Ton

1 Kilogram = 0.0011023122 Short Ton

1 Kilogram = 2.2046244202 Pound

1 Kilogram = 35.273990723 Ounce

1 Kilogram = 5000 Carat

1 Kilogram = 0.1763698097 Stone (US)

1 Kilogram = 0.1574730444 Stone (UK)

1 Kilogram = 15432.358353 Grain

1 Kilogram = 0.0685217659 Slug

1 Kilogram = 0.01 Quintal

1 Kilogram = 0.0881849049 Quarter (US)

1 Kilogram = 0.0787365222 Quarter (UK)

1 Kilogram = 0.0220462262 Hundredweight (US)

1 Kilogram = 0.0196841306 Hundredweight (UK)

1 Kilogram = 34.285710367 Ton (assay) (US)

1 Kilogram = 30.612244898 Ton (assay) (UK)

1 Kilogram = 0.001 Tonne

1 Kilogram = 0.000001 Kiloton

1 Kilogram = 6.022173643e+26 Dalton

1 Kilogram = 0.1019716213 Kilogram-force square second per meter

1 Kilogram = 0.0022046226 Kilopound