When does two cubes have similar to the same equivalent? When they go to a different location and a & # 39; Increasing hydraulic quantities and pollution.
Analyzing its & # 39; In this case, the National Institute of Standards and Technology (NIST) and National Research Council (Canada) cooperate with a measurement laboratory in North, South and South America to develop a greater understanding Find out how the detailed evaluations arise and their falling over time.
They hope that the results will benefit internationally, where even bad impact assessments can affect them.
To ensure that a potato bottle of potatoes have a potatoe; focusing on a note, the balance of storage must be recorded regularly. For this type of calibration, users at the end depend on large articles, metal pieces that have been carefully damaged. Scientists know most of all because each species has been compared to other things in a series of unreasonable comparisons that do not exist. stretching back to the basic definition of mass itself.
Quality laboratories maintain large animations for comparisons such as those that are used at a & # 39; Ultimately to record everything from grosor opportunities to a restaurant room screen. Occasionally, these sites require extra mass mass or for their collection.
In the first month of his life, however, new generosity can change greatly because the new feathers that are in the middle of the world. metal cutting and maintenance of environmental assumptions.
There is a little disagreement as long as scientists need to wait before they can make sure that new genius is new. So NIST and NRC Canada designed the new test to help solve this case.
The test comprises 60 equal one-kilogram weight, is ordered to be made from a stainless steel rod of steel; high status. About half of these 60 units were distributed to 29 countries within the Inter-American Meat System (SIM), a network of national metadata institutions (NMI) in the north, southern and central America, as well as island countries.
For a year or more, the SIM representative of each country will measure the size of their work every few months and send information on NIST and NRC Canada. They also monitor the environment of every globe, and # 39; including speech temperature, barometric pressure, humidity and transient organic companies (VOCs), air quality measurement.
"The whole thing will be a major stability survey on a scale that never made anybody ever before," said NIST physicist Patrick Abbott. "Because most of the steel rods are expected, they would expect the same long-term response." However, it is expected that the conditions in the different SIM laboratories will affect the degree of variation changing, depending on the characteristics of the height and the amount of salt in the air. For the first months of their lives, the majority were held in the USA and Canada. Now, half of them are stored in laboratories near a middle zone and into the southern hemisphere.
"So how will the mission change?" Abbott said. "When they come down there, they do not follow the same pattern as they are in North America."
Cat Hair on Black Pants
There is a new, newly-cut, spong-like article: It's a glucose gathering from the air, and this is a Increasing most a little over time. The new articles used in this test are less than a year old and, thus, in an average level of rapid increase in order of 7 micrograms (millions of grammar) over six months . This may be very small for your case, but even minor changes – especially if they are seen – can not be taken in probation .
"These weights are changing," said Abbott. "They are building objects of the type of air like the two black in a house with a white cat."
At any time, this process will usually be stopped or stopped; significantly reduced. It's a question, how long & # 39; Does a laboratory wait for it to be sure that its majority have reached a stable level? And how does that time change according to bed conditions and a normal environment setting?
Previous studies were likely to be small, kept in one laboratory. Abbott and his NIST colleagues and NRC Canada believed that more effort would help to resolve them in earlier results.
"At present, many of the checks carried out have been well-cultivated: one list, one person, under one set of settings," said Abbott. "But another person in another work could do the same study and say," under these conditions, we got something completely different, "" continued. So who's right?
"I hope this survey will be able to answer the question: If you buy a mass for what you are talking about, what is a reasonable expectation of when you would enter the service, and you have confidence? " Abbott said.
More on Single Mass
Prior to the release of the material, NIST and NRC Canada were markedly marked by comparing their density as well as their. Movement that they produce, the quality of the content of the product; Behavior when it is open to a magnetic range. Each of the institutions made half of the majority: NRC Canada even produced numbers, and NIST became the odd numbers.
To measure the size of half of the weights, Canadian scientists used a hydrostatic method that included a & # 39; Each subsequent species focuses on differentiated distinctive oysters. At the same time, NIST carried out their tests above, using a help room; The evaluations may be evaluated in different density.
Although it was said that there were so many of the same names, Abbott was surprised to find that there was a different congestion between his & her; The first 15 weight he was measuring from the second one 15. He was worried that he made a mistake – until he found out that Canada's similar measurements were the same staggering in their pressures .
"The maker seems to have used two different steelboats with different congestion," said Abbott, "and we saw it in our measure."
When they put data on to find out how close the numbers were aligned, Abbott said, "It was beautiful, just beautiful. We used two different ways, and we had excellent agreement for this study. "
Earlier this month, NIST and NRC Canada delivered 29 out of the 60s, one for each country country that was in the past; participating in South and Central America. NIST and NRC Canada will keep what remains until the inspection is carried out.
Until May 19, 2019, the world's definition of mass based on the International Kilogram Protocol (IPK), a metal cylinder that was demolished in the late 19th century and held at a side surgery out of Paris, France. After this date, a formal definition of kilograms will be modified to depend on the fundamental dependence of nature. However, it is still expected to use kilogram content in many requests, and including the distribution of new casualties.
Distributing the new kilogram – & # 39; running internationally