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Kilogram (kg)
The kilogram is the SI base unit of mass, representing the amount of matter in an object.
It is symbolized as kg.
Since 2019, the kilogram is defined by fixing the value of the Planck constant to exactly joule seconds, linking mass to fundamental physical constants.
Before this, it was defined by a physical platinum-iridium prototype.
It is the only SI base unit still using the prefix "kilo" in its name.
Key points:
1 kg is the base unit of mass in the metric system
Defined using the Planck constant for high precision
Widely used globally in science, industry, and everyday life
The kilogram ensures accurate and universal mass measurements across the world.