# Questions tagged [physical-constants]

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### The fine structure constant

I have a question about the really meaning of the fine structure constant. Actually, my doubt is why the physicist look to a meaning for this constant. I understand the difference between this ...
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### Are there multiple Rydberg constants?

I'm sorry if this is a trivial question, I'm trying to understand the Rydberg formula and unsure if there are different values for the Rydberg constant? According to Wikipedia's articles about ...
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### What does the derived unit “square coulomb” quantify?

As a square meter (m$^2$) quantifies area and not length, what does a square coulomb (C$^2$) quantify?
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### Can $G$ (Newton's constant) be thought of as a fundamental parameter of physics? [closed]

Can I think of Newton's Gravitational Constant as a fundamental parameter of nature (based on our current understanding of physics)? I realize that it is very unlikely that $G$ is actually a ...
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### Is our metrics and/or constants geocentric?

Considering that all our metrics is now based on physical constants as measured here on earth, With earth having both gravity and velocity, as well as the whole solar system having too, and special ...
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### What is gravitational constant in this context? [closed]

I've been reading an article and it gives me the following formula: $\vec{v}_B(t) = \vec{v}_0 - \mu_sgt \hat u_0$ It governs the velocity of a ball. In its explanation, it says: The ...
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### Is my friend right about omitting $c^2$ in world famous tiny equation?

I know $E = mc^2$ says that inertial mass of a system is equal to the total energy content of a system in its rest frame. My friend told me the $c^2$ can be omitted from this equation because that's ...
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### About the physical definition of the Planck's constant

In Quantum Mechanics (QM), the Planck's constant has the S.I. units of (energy) x (time). So, how should one interpret that?! How should I understand the physical meaning of the following relations? ...
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### How can any speed be defined as a constant? [duplicate]

We know that the speed of light is a constant, and can therefore be used to calculate many other relative values, but I'm having difficulty understanding how speed can be a constant, seeing as it's ...