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Kilogram (kg)

The kilogram is the SI base unit of mass, representing the amount of matter in an object.

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  It is symbolized as kg.

  
  
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  Since 2019, the kilogram is defined by fixing the value of the Planck constant to exactly $6.62607015 \times 10^{-34}$ joule seconds, linking mass to fundamental physical constants.

  
  
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  Before this, it was defined by a physical platinum-iridium prototype.

  
  
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  It is the only SI base unit still using the prefix "kilo" in its name.

  
  

Key points:

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  1 kg is the base unit of mass in the metric system

  
  
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  Defined using the Planck constant for high precision

  
  
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  Widely used globally in science, industry, and everyday life

  
  

The kilogram ensures accurate and universal mass measurements across the world.