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Physical-constants
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Is speed of light a ratio or a universal constant?
August 31st, 2021
physical-constants
spacetime
speed-of-light
time
Is Planck's Constant Really a Constant?
August 1st, 2022
quantum-mechanics
operators
commutator
physical-constants
deformation-quantization
Why was the Planck constant $h$ fixed to be exactly $6.62607015\times10^{−34}\text{Js}$ and not some other value?
December 8th, 2020
physical-constants
si-units
metrology
Free parameters in the Standard Model
May 14th, 2020
particle-physics
experimental-physics
standard-model
physical-constants
Comparing the strength of gravity and electricity
October 2nd, 2020
order-of-magnitude
physical-constants
coulombs-law
dimensional-analysis
newtonian-gravity
What's exactly the new definition of kilogram, second and meter?
September 28th, 2020
metrology
si-units
physical-constants
measurements
Gravitational Constant in Newtonian Gravity vs. General Relativity
February 12th, 2020
general-relativity
gravity
newtonian-gravity
physical-constants
Could Planck's constant be changing?
August 1st, 2022
experimental-physics
quantum-mechanics
physical-constants
Where does the fine structure constant come from?
January 3rd, 2020
interactions
physical-constants
quantum-electrodynamics
atomic-physics
Why is the gravitational constant so difficult to measure?
August 23rd, 2020
newtonian-gravity
physical-constants
experimental-physics
The origin of the value of speed of light in vacuum
December 3rd, 2021
physical-constants
speed-of-light
special-relativity
Is there a name for what Feynman called a fundamental constant i.e. "ratio of electrical repulsion to gravitational attraction between electrons"?
May 23rd, 2021
physical-constants
coulombs-law
electrostatics
newtonian-gravity
terminology
The famous drop of $c$
March 18th, 2020
physical-constants
speed-of-light
history
metrology
Does the speed of light in vacuum define the universal speed limit?
August 1st, 2022
physical-constants
special-relativity
photons
mass
speed-of-light
Is $\pi^2 \approx g$ a coincidence?
August 1st, 2022
history
dimensional-analysis
physical-constants
approximations
si-units
Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?
August 29th, 2021
reference-frames
speed-of-light
electromagnetic-radiation
physical-constants
special-relativity
Do the laws of physics evolve?
March 8th, 2021
cosmology
time
cosmological-constant
laws-of-physics
physical-constants
How can any speed be defined as a constant?
April 3rd, 2020
reference-frames
special-relativity
speed-of-light
relative-motion
physical-constants
Why is the Planck constant an exact number with defined value?
October 12th, 2020
metrology
si-units
physical-constants
quantum-mechanics
How to get Planck length
January 5th, 2020
black-holes
absolute-units
physical-constants
dimensional-analysis
quantum-gravity
Is the Boltzmann constant really that important?
December 26th, 2020
thermodynamics
statistical-mechanics
physical-constants
Why isn't it $E \approx 27.642 \times mc^2$?
March 12th, 2021
metrology
physical-constants
dimensional-analysis
units
Is the Planck length the smallest length that exists in the universe or is it the smallest length that can be observed?
November 27th, 2020
spacetime
discrete
physical-constants
quantum-gravity
2002 research: speed of light slowing down?
October 29th, 2020
experimental-physics
speed-of-light
physical-constants
quasars
Why should the Planck constant be a constant throughout all space?
October 15th, 2020
spacetime
physical-constants
quantum-mechanics
Dimensionless Constants in Physics
October 8th, 2020
dimensional-analysis
physical-constants
What is the proof that the universal constants ($G$, $\hbar$, $\ldots$) are really constant in time and space?
September 13th, 2020
gravity
speed-of-light
physical-constants
experimental-physics
How do scientists know the min limit of temperature is -273 degree celsius?
August 1st, 2022
thermodynamics
temperature
universe
physical-constants
How can the speed of light be a dimensionless constant?
August 1st, 2022
physical-constants
dimensional-analysis
Physicists adding 3 decimals to the fine structure constant is a big accomplishment. Why?
December 13th, 2020
physical-constants
quantum-electrodynamics
atomic-physics
experimental-physics
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