Replacing 'Le Grand K': Question

  • Thread starter Bryan Parry
  • Start date
In summary, "Le Grand K" is the International Prototype of the Kilogram (IPK), used as the standard for the kilogram measurement since 1889. Due to slight changes in its mass over time, it needs to be replaced with a more stable standard. The replacement will be based on the Planck constant and measured using a device called the Kibble balance. The official replacement is scheduled for May 20, 2019. This replacement will have a significant impact on scientific research and everyday life, ensuring more accurate and precise measurements and affecting industries such as pharmaceuticals and manufacturing.
  • #1
Bryan Parry
44
0
I have a question. Given we cannot determine accurately enough the actual size of the Planck mass and other natural constants, which is the most accurate way of fixing the mass standard (theoretically).

1. The mass of a certain volume of water udner certain specified conditions?

or...

2. The mass of some lump of metal (i.e. Le Grand K)

or...

3. Some fraction of the mass of the Earth (or sun, or moon or Mars etc)

4. Equal to the energy of some natural constant or other

or... some other way?


Bascially, there have been problems getting rid of the metal kilogramme prototype as we cannot more accurately produce a mass standard tied to natural constants.
So, could somebody help me out here and tell me which of the above methods would be best/most accurate way of establishing the new mass standard.

cheers :D
 
Physics news on Phys.org
  • #2
The most accurate way of fixing the mass standard is by using the Planck constant, which is defined as the ratio between a given mass and its corresponding energy. This method has the advantage of being related to fundamental constants, meaning that it is based on universal physical principles, rather than on any particular material or reference object. It also provides a more precise and reproducible way of establishing a mass standard than any of the above methods.
 

1. What is "Le Grand K"?

"Le Grand K" is a physical object known as the International Prototype of the Kilogram (IPK), which has been used as the standard for the kilogram measurement since 1889.

2. Why does "Le Grand K" need to be replaced?

Over time, "Le Grand K" has been found to have slight changes in its mass, which can cause inconsistencies in measurements. To ensure accuracy and reliability, it is necessary to replace it with a more stable standard.

3. What will be used to replace "Le Grand K"?

The new standard for the kilogram will be based on a fundamental constant of nature, known as the Planck constant. This will be measured using a device called the Kibble balance, which can accurately determine mass based on electromagnetic forces.

4. When will "Le Grand K" be replaced?

The official replacement of "Le Grand K" is scheduled to take place on May 20, 2019, during the General Conference on Weights and Measures in Paris, France.

5. How will the replacement of "Le Grand K" affect scientific research and everyday life?

The replacement of "Le Grand K" will have a significant impact on scientific research and everyday life. It will ensure more accurate and precise measurements, leading to advancements in various fields such as physics, chemistry, and engineering. It will also affect industries that rely on precise measurements, such as pharmaceuticals and manufacturing.

Similar threads

  • Other Physics Topics
Replies
25
Views
3K
  • Other Physics Topics
Replies
11
Views
2K
  • Introductory Physics Homework Help
Replies
17
Views
2K
Replies
8
Views
3K
  • Beyond the Standard Models
Replies
0
Views
897
  • Special and General Relativity
2
Replies
45
Views
3K
  • STEM Academic Advising
Replies
8
Views
822
  • High Energy, Nuclear, Particle Physics
Replies
2
Views
2K
  • Special and General Relativity
3
Replies
95
Views
4K
  • Electromagnetism
Replies
28
Views
2K
Back
Top