Kilogram’s new definition hailed as historic, ground-breaking

VERSAILLES, France — In a historic vote, nations on Friday unanimously approved a ground-breaking overhaul to the international system of measurements that underpins global trade and other vital human endeavors, uniting together behind new scientific definitions for the kilogram and other units in a way that they have failed to do on so many other issues.

Scientists, for whom the update represents decades of work, clapped, cheered and even wept as the 50-plus nations gathered in Versailles, west of Paris, one by one said “yes” or “oui” to the change, hailed as a revolution for how humanity measures and quantifies its world.

The redefinition of the kilogram, the globally approved unit of mass, was the mostly hotly anticipated change. For more than a century, the kilogram has been defined as the mass of a cylinder of platinum-iridium alloy kept in a high-security vault in France. That artefact, nicknamed “Le Grand K,” has been the world’s sole true kilogram since 1889.

But now, with the vote, the kilogram and all of the other main measurement units will be defined using numerical values that fit handily onto a wallet card. Those numbers were read to the national delegates before they voted.

 

Scientists at the meeting were giddy with excitement: some even sported tattoos on their forearms that celebrated the science.

Nobel prize winner William Phillips called the update “the greatest revolution in measurement since the French revolution,” which ushered in the metric system of meters and kilograms.

Jon Pratt of the U.S. National Institute of Standards and Technology said the vote left him “a basket case” and “extremely emotional.”

“Those units, those constants chosen now, include everything we know, everything we have always known and provide that springboard for us to go pursue those things that we don’t know,” he said. “That was just leaving me in a puddle of tears.”

The Grand K and its six official copies, kept together in the same safe on the edge of Paris and collectively known as the “heir and the spares,” will be retired but not forgotten. Scientists want to keep studying them to see whether their masses decay over time.

The change will have no discernable impact for most people. Bathroom scales won’t suddenly get kinder and kilos and grams won’t change in supermarkets.

But the new formula-based definition of the kilogram will have multiple advantages over the precision-crafted metal lump that set the standard from the 19th century to the 21st, through periods of stunning human achievement and stunning follies, including two world wars.

Unlike a physical object, the new formula for the kilo, now also known as “the electric kilo,” cannot pick up particles of dust, decay with time or be dropped and damaged.

It is expected to be more accurate when measuring very, very small or very, very large masses and help usher in new innovations in science, industry, climate study and other fields.

With time, as the science behind the new definition becomes more accessible and affordable, it should also mean that countries won’t have to send their own kilograms back to France to be checked occasionally against Le Grand K, as they have done until now, to see whether their mass was still accurate.

ad-high_impact_4
News
A record breaking donation of nearly $9 million to Girls Scouts of Southern Nevada
A record breaking donation of property valued at nearly $9 million was made to the Girls Scouts of Southern Nevada by the Charles and Phyllis M. Frias Charitable Trust. Bizuayehu Tesfaye/Las Vegas Review-Journal. @bizutesfaye
Multi-agency DUI Strike Team focused solely on arresting impaired drivers
The newly formed DUI Strike Team made up of Las Vegas police officers and Nevada Highway Patrol Troopers have hit the streets looking for impaired drivers. (K.M. Cannon/Las Vegas Review-Journal)
Christmas Tree Inspection
Nevada Division of Forestry employees search for illegally harvested Christmas trees in local lots during the holidays. (Michael Scott Davidson/Las Vegas Review-Journal)
One dead in a suspected DUI crash in east Las Vegas
The crash was reported just before 4:10 a.m. at Washington and Eastern avenues.
Vegas Homeless Remembered
Las Vegas vigil remembers 179 homeless people who died over the past year in Clark County. (David Guzman/Las Vegas Review-Journal)
A look inside Tesla’s Nevada Gigafactory
Tesla's Gigafactory east of Reno produces the batteries that fuel the company's electric cars. Production has created more than 7,000 jobs, and the campus that includes one of the largest buildings in the world is expected to triple in size by the time it is completed. Tesla Vice President Chris Lister leads a tour of the facility. (Bill Dentzer/Las Vegas Review-Journal)
Garnet Interchange Ribbon Cutting
The Nevada Department of Transportation celebrated the completion of the $63 million I-15-US 93 Garnet Interchange project. The project includes a modified diverging diamond interchange and a 5-mile widening of US 93.
State Foresters Hunt for Record Trees
Urban foresters from the Nevada Division of Forestry hunt for record setting trees.
Rick Davidson directs NFR satellite feed
Rick Davidson directs the Wrangler NFR's live satellite feed from a production trailer outside the Thomas & Mack Center. (Patrick Everson)
Scott Boras, Bryce Harper's agent, speaks to media at baseball's winter meetings
Baseball agent Scott Boras updates media on the contract negotiations of his client Bryce Harper during baseball's winter meetings at Mandalay Bay in Las Vegas, Nevada, on Dec. 12, 2018. (Ron Kantowski/Las Vegas Review-Journal)
Achievement School District
The achievement district faced strong opposition from traditional schools back in its beginnings in 2016. But with schools like Nevada Rise and Nevada Prep, it's slowly and steadily growing. Amelia Pak-Harvey/Las Vegas Review-Journal
Fresno State QB on record-breaking receiver
Fresno State quarterback Marcus McMaryion talks record-setting receiver KeeSean Johnson. Video by Mark Anderson/Las Vegas Review-Journal
The annual 'Shop with a Cop' event at Target
This year’s "Shop with a Cop" event gave about 40 children the chance to shop at Target alongside a North Las Vegas Police officers. Bizuayehu Tesfaye/Las Vegas Review-Journal @Bizutesfaye
Melvin Dummar dead at 74
Melvin Dummar has died at 74. Dummar was famous for claiming to have saved Howard Hughes in a Nevada desert in 1967. Dummar claimed to have been left $156 million in Hughes’ will. The will mysteriously appeared after Hughes’ death in 1976. It was dismissed as a fake two years later. Dummar never saw a dime of the billionaire's fortune. Dummar died Saturday in Nye County.
Officer-involved shooting in Nye County
The Nye County Sheriff's Office gives information about a shooting in Pahrump on Thursday night after a man began firing shots outside of his home. (Nye County Sheriff's Office)
Law Enforcement Active Shooter Training Exercise
Multiple Las Vegas Valley law enforcement agencies held an active shooter drill at the Department of Public Safety’s Parole and Probation office on December 6, 2018. Officials set up the training exercise to include multiple active shooters, a barricaded suspect and multiple casualties. (Katelyn Newberg/ Las Vegas Review-Journal)
Public memorial service for Jerry Herbst
Archiving effort hits milestone at Clark County Museum
The Clark County Museum catalogs the final item from the bulk of Route 91 Harvest festival artifacts. (John Przybys/Las Vegas Review-Journal)
Pearl Harbor survivor Edward Hall talks about his memories of Dec. 7, 1941
U.S. Army Corps Edward Hall, a 95-year-old survivor of Pearl Harbor talks about his memories of that horrific day. Bizuayehu Tesfaye/Las Vegas Review-Journal @bizutesfaye
Final Route 91 Harvest festival remembrance objects catalogued at Clark County Museum
The last of the more than 17,000 items left at the makeshift memorial near the Las Vegas sign after the Oct. 1 shootings have been catalogued at the Clark County Museum in Las Vegas. The final item was a black-and-white bumper sticker bearing "#VEGASSTRONG. An additional 200 items currently on display at the museum will be catalogued when the exhibit comes down. (K.M. Cannon Las Vegas Review-Journal)
Dozier execution timeline
Scott Dozier was set to be executed July 11, 2018, at the Ely State Prison. Judge Elizabeth Gonzalez delayed the execution.
Grand Jury Indicts Constable for theft
A Clark County grand jury indicted Henderson Constable Earl Mitchell. A Las Vegas Review-Journal investigation prompted the criminal probe. The newspaper found Mitchell wrote himself thousands in checks, took out cash at ATMs and traveled on county funds. He faces four felony counts of theft and a county of public misconduct. Mitchell and his attorney could not be reached for comment.
93-year-old WWII veteran arrested during visit to VA hospital
Dr. S. Jay Hazan, 93, a World War II veteran, talks about his arrest during his visit to VA hospital on Friday, Nov. 30. (Erik Verduzco Las Vegas Review-Journal @Erik_Verduzco_
Pearl Harbor survivor struggles in her senior years
Winifred Kamen, 77, survived the attack on Pearl Harbor as an infant, works a 100 percent commission telemarketing job to make ends meet. (K.M. Cannon Las Vegas Review-Journal)
Las Vegas Metropolitan Briefing 18th street gang
Las Vegas Metropolitan briefs the media on the recent arrests made regarding the 18th street gang.
Man shot in Las Vegas traffic stop had knife, police say
Police said the man fatally shot by an officer during a traffic stop in downtown Las Vegas had a “homemade knife.” Demontry Floytra Boyd, 43, died Saturday at University Medical Center from multiple gunshot wounds after officer Paul Bruning, 48, shot him during a traffic stop. Bruning pulled Boyd over on suspicion of driving recklessly at 7:41 a.m. near Sunrise Avenue and 18th Street.
Catahoula dogs rescued from home in Moapa Valley
Catahoula dogs were brought to The Animal Foundation after being rescued from home in Moapa Valley.
Intuitive Forager Kerry Clasby talks about losses in California wildfire
Intuitive Forager Kerry Clasby talks about losses she suffered in California's Woolsey Fire in Malibu in November. (Al Mancini/Las Vegas Review-Journal)
Benefit dinner for Kerry Clasby, the Intuitive Forager
Sonia El-Nawal of Rooster Boy Cafe in Las Vegas talks about having a benefit for Kerry Clasby, known as the Intuitive Forager, who suffered losses on her farm in California’s Woolsey Fire in Malibu. (Al Mancini/Las Vegas Review-Journal)
TOP NEWS
News Headlines
Home Front Page Footer Listing
Circular
You May Like

You May Like