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Curated category

SI base quantities

  • LengthA single metre ruler sits on a table. It measures distance along one spatial dimension. This physical property distinguishes length from area and volume.
  • TimeTime is the continuous progression of existence that occurs in an apparently irreversible succession from the past, through the present, and into the future.
  • MassThe Maß is not merely a container but a legally defined unit of volume that has evolved from a variable regional measure into a precise one-liter standard.