- #1
dand5
- 28
- 0
How is the permittivity of free space, [tex]\epsilon_0[/tex], and the magnetic permeability in vacuum, [tex]\mu_o[/tex], measured?
Thanks
Thanks
dand5 said:Ok, I understand how the permiability is defined now. But I thought that the permitivitty of free space existed before the speed of light was defined.
Also, I always thought the reason c could be "defined" was because the permiability and the permitivitty appeared in the Maxwell's equations out of which comes that relation for vacuum?
But you are saying that c is defined first, then the permitivitty is determined. Is that right?
Ok, I understand how the permiability is defined now. But I thought that the permitivitty of free space existed before the speed of light was defined.
dand5 said:Ok, I understand it now. Thanks. Just out of curiosity, why was 1/299792458 chosen? Did it best match the existing second?
Fundamental constants are measured using a variety of methods, such as experiments that involve precise measurements of natural phenomena or theoretical calculations based on physical laws and principles. Some constants, like the speed of light, can be measured directly, while others may require more complex techniques.
The two fundamental constants typically referenced in this context are the speed of light (c) and the gravitational constant (G). These constants play a crucial role in describing the behavior of the universe and are used in various scientific equations and theories.
Accurate measurements of fundamental constants allow scientists to better understand the laws and principles that govern our universe. They also help in developing and testing scientific theories, as well as in technological advancements and applications.
The measurements of fundamental constants have improved and become more precise over time as scientific instrumentation and techniques have advanced. For example, the measurement of the speed of light has increased in accuracy from 0.0001% in the 17th century to 0.000000000000000000001% in modern times.
Yes, there are always uncertainties in any scientific measurement. Factors like experimental error, limitations of technology, and the complexity of the phenomena being measured can contribute to these uncertainties. Scientists strive to minimize these uncertainties through rigorous testing and verification methods.