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Japan's meter and kilogram prototypes shown ahead of 150th anniversary

Japan's National Institute of Advanced Industrial Science and Technology showcased the country's meter and kilogram prototypes ahead of the 150th anniversary of the Meter Convention. The original prototypes, created in 1890, have evolved due to technological advancements, leading to updated definitions using light wavelengths and the Planck constant.

Key points

  • Japan's prototypes of meter and kilogram were presented at AIST in Tsukuba ahead of the Meter Convention's 150th anniversary.
  • The Meter Convention established standard units of measurement in 1875.
  • Initial definitions were based on physical measurements (earth's dimensions and water mass).
  • International prototypes of meter and kilogram were created using a platinum-iridium alloy and sent to Japan in 1890.
  • Technological advances revealed inaccuracies in the metal prototypes, leading to a redefinition of the meter in 1960 using light wavelengths.
  • In 1983, the meter was further refined, now defined by the distance light travels in a certain time.
  • The kilogram was updated in 2019 to be based on the Planck constant.
  • The original kilogram prototype at AIST has maintained its mass more stably than others globally for the past century.

Why it matters

  • The Meter Convention is part of a historical trend towards standardizing measurements, vital for international trade and science.
  • The continuous updates reflect advancements in measurement science and physics, relevant in today’s precision-based technology fields.
  • The evolution of measurement standards aligns with 2025 IT trends emphasizing data accuracy and reliability in tech innovations.

The display of Japan's measurement prototypes highlights the importance of precise standards, showcasing a century of advancements in measurement science and emphasizing ongoing relevance in technology and international standards.