Kilogram (kg)
Definition: Kilogram (symbol: kg) na SI base unit of mass. Since 2019, dem define am by fixing the Planck constant to exactly 6.626 070 15 × 10^-34 joule-seconds, replace the old definition wey base on physical platinum-iridium cylinder.
History/origin: For 1795 dem first define kilogram as the mass of one liter of water for 4 °C. For 1889 dem redefine am as the mass of the International Prototype of the Kilogram (IPK) wey dem keep for France. For 2019 dem tie am to fundamental physical constant instead.
Current use: Kilogram na standard mass unit for almost everywhere. Dem dey use am for trade, science, food packaging, and health. Body weight, food portions, and shipping weights dey usually dey expressed for kilograms worldwide.