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Results tagged with physical-constants
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This tag is for questions relating to physical constants which are any of a set of fundamental invariant quantities observed in nature and appearing in the basic theoretical equations of physics. Accurate evaluation of these constants is essential in order to check the correctness of the theories and to allow useful applications to be made on the basis of those theories.
2
votes
Can $G$ (Newton's constant) be thought of as a fundamental parameter of physics?
Can I think of Newton's Gravitational Constant as a fundamental parameter of nature (based on our current understanding of physics)?
Can the speed of light be thought of as another "fundamental par …
- 109k
4
votes
Accepted
On existence of other physical constants and the assumption in proof for special theory of r...
The only constant (that exist in the world) is speed of light in vacuum or c which is close to 3X10^8 m/s so 'all other constants should be variables (to some degree) w.r.t. this constant'. If this …
- 109k
4
votes
Is there a explanation to why bodies with higher heat capacity transfer heat to bodies with ...
It is not generally true that heat is transferred from $M_1$ to $M_2$. Suppose, for a counter-example, that both bodies are made of water so $c_1=c_2$ and suppose further that $m_1=2 \text{ kg}$ and $ …
- 109k
0
votes
Is the fine-structure constant related to the size of the observable universe?
My question is, is the logarithm of the size of the observable universe, log(10^60)≈138 related to the fine-structure constant (electron charge)?
You could pick units such that the log of the si …
- 109k
1
vote
How does the constant proportionality balance an equation?
1)How do we define a certain value to the proportionality constant?
This is done experimentally. We take many different objects at different sizes and distances and we measure the gravitational forc …
- 109k
8
votes
What physics laws justify Planck's units?
We have, at yet, no specific evidence that any of our current laws of physics collapse at the Planck scale. However, we do expect that at or near the Planck scale quantum gravitational effects will be …
- 109k
4
votes
Why can we set $c$ and $\hbar$ to 1 when it changes the result?
If you ask two doctors how much you weigh and one doctor says “you weigh $100\text{ kg}$” and the other doctor says “you weigh $220\text{ lbs}$”, would you claim that they have given you completely di …
- 109k
2
votes
Can a physical quantity be of different dimensions depending of the system of measurement?
can a physical quantity be of different physical dimension depending on the system of measurement?
Yes, most definitely! The dimension of a physical quantity is a matter of convention which is es …
- 109k
4
votes
Are $2$ and $1/2$ universal constants?
2, 1/2, $\pi$, etc. are indeed universal constants, but they are universal mathematical constants rather than universal physical constants. They are either known exactly or they can be calculated to a …
- 109k
2
votes
What is the exact definition of the Universal Gas Constant $R$? One that gives the reason fo...
The ideal gas constant is not a physical quantity, it is an artifact of your choice of units. In SI units its value is exactly: $R = 8.31446261815324 \text{ J/(K⋅mol)}$. The fact that the value is exa …
- 109k
1
vote
If all fundamental constants changed proportionally would we know?
It is not possible for all constants to change proportionally, due to the various relationships between constants. A good example is the fine structure constant which can be written as: $$\alpha =\fra …
- 109k
7
votes
Accepted
Are all lengths multiples of the Planck length?
Yes, all lengths are multiples of the Planck length. All lengths are also multiples of the meter and the mile and the parsec. The Planck length is just another unit length and all lengths may be expre …
- 109k
0
votes
Can the Planck length be altered by relativistic motion?
In standard relativity the Planck length is just another unit. It contracts just as the meter and the mile do.
Perhaps a future theory of quantum gravity will say something different.
- 109k
1
vote
Are there any significant integer constants that are not unitless?
Are there any significant integer constants that are not unitless?
Values that are not unitless are called “dimensionful”.
Unfortunately, this question is not meaningful. The numerical value of any …
- 109k
27
votes
What's exactly the new definition of kilogram, second and meter?
The SI system is now defined entirely by physical constants. There are no more “prototype” artifacts. How it works is thus:
https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9-concise-EN.p …
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