Japan Marks 150 Years of Meters

May 15, 2025 | News On Japan

IBARAKI, May 15, 2025 (News On Japan) - Japan’s prototypes of the kilogram and meter, which once served as national standards for weight and length, were presented to the press this week ahead of the 150th anniversary of the Meter Convention, the international treaty that standardized global measurement systems, to be marked on May 20th.

The prototypes were replicas of the international standards housed by the International Bureau of Weights and Measures (BIPM) in Sèvres, France, and were distributed to member countries of the treaty. Japan received its copies in 1890 during the Meiji era, officially establishing them as domestic benchmarks for measurement.

Both the kilogram and meter prototypes are now designated as Important Cultural Properties. While the meter prototype was retired following the adoption of light wavelength as the international standard for length, the kilogram prototype continues to be used alongside newer definitions based on physical constants.

Takashi Usuda, Director of the National Metrology Institute of Japan at AIST, stated, "The metric system has supported the world as a 'universal language' for determining all things. I hope the 150th anniversary will prompt reflection on its enduring significance."

The Meter Convention was signed in 1875 by 17 countries with the goal of standardizing measurement systems across nations. Japan joined the treaty in 1885.

Source: 産経ニュース

New Typhoon May Approach Okinawa During Silver Week

A tropical depression south of Japan is expected to develop into a typhoon on September 15 and could affect Okinawa during Silver Week, raising concerns over travel and tourism as Japan prepares for its first five-day Silver Week holiday in 11 years.

Helicopter Rescues on Mt. Fuji to Incur Fee

Climbers who get into trouble on Mount Fuji during the official closed season could be charged for rescue by disaster-prevention helicopters under new safety measures being considered by Yamanashi Prefecture.

LDP-Backed Koja Wins Okinawa Governor Race

Genta Koja, a former deputy mayor of Naha who accepts the relocation of the U.S. Marine Corps Air Station Futenma to Henoko in Nago, won the Okinawa gubernatorial election on September 13, defeating incumbent Governor Denny Tamaki and bringing an end to 12 years of prefectural administrations committed to blocking the project.

Flooding Hits Fushimi Otesuji Shopping Street in Kyoto

Roads around the Fushimi Otesuji Shopping Street in Kyoto's Fushimi Ward were flooded on the evening of September 13 after water began gushing from a nearby road, forcing authorities to close part of the street to traffic.

China Raises Visa Fees for Japanese Travelers Sevenfold

China will sharply raise visa fees for Japanese nationals entering the country from September 14, with the cost of a single-entry visa increasing to 16,750 yen, about 7.4 times the current level.

MEDIA CHANNELS

MORE Sci-Tech NEWS

Cybercab Arrives in Japan

Tesla unveiled its Cybercab in Japan for the first time on September 11, showcasing an AI-powered autonomous taxi designed without a steering wheel or pedals.

Footage Shows Tokyo Flood Control Tunnel After Heavy Rain

Large volumes of floodwater poured into the Metropolitan Area Outer Underground Discharge Channel in Kasukabe, Saitama Prefecture, following heavy rain on September 7, prompting the massive underground flood-control facility known as the "Underground Temple" to go into operation.

Lights Out for Fluorescent Lamps

Fluorescent lamps that have illuminated Japanese homes and workplaces for decades are approaching the end of production, with Panasonic preparing to wind down a business it has operated since 1951 while experts warn that incorrectly replacing some fixtures with LEDs could create a fire risk.

Dry Fog Finds New Uses in Industry, Farming and Tourism

Osaka-based spray nozzle maker IKEUCHI is expanding applications for its proprietary "Dry Fog," an ultra-fine mist that can cool, humidify and create visual effects without leaving surfaces wet, with the technology now being used in factories, livestock farming, crop cultivation and tourist attractions in Japan and overseas.

Japan Moves to Commercializing Low-Power Optical Computing

Japanese companies are moving closer to commercializing photonics-electronics convergence technology that replaces part of conventional electrical data transmission with optical signals, potentially allowing huge volumes of data to move with lower latency while sharply reducing power consumption as artificial intelligence drives rapid growth in electricity demand from data centers.

Just 27 Centimeters Could Dramatically Reduce Power Consumption

A new generation of optoelectronic integration technology developed over four decades by Japanese companies is moving closer to commercialization, offering a way to transmit huge volumes of data with low latency while sharply reducing the electricity consumed by data centers as artificial intelligence drives explosive growth in computing demand.

CameraJet Connects Cleaning Coaching and Privacy

Dyson CameraJet™ turns the smart toothbrush into an active sensing product, making useful feedback and clear privacy design part of the same engineering brief.

Japanese Researcher Wins Ig Nobel Prize

A late former professor at Asahikawa Medical University has won the Ig Nobel Prize in Medicine for scientifically examining the proper way to blow the nose, extending Japan's streak of Ig Nobel winners to 20 consecutive years.

< 2 3 4 5 >