New post in Physical-constants

Why do we obtain classical physics by taking the limit of Planck's constant to zero?

December 29th, 2020

Is the fine structure constant actually a constant or does its value depend on the energy scale?

August 1st, 2022

What if the size of the Universe doubled?

February 28th, 2020

Why do we need constants?

April 18th, 2020

Planck mass is about the mass of one eyebrow hair

August 1st, 2022

Why are the classical electron radius, the Bohr radius and the Compton wavelength of an electron related to each other?

August 1st, 2022

Why is the Planck length considered fundamental, but not the Planck mass?

August 1st, 2022

Is the speed of light in vacuum always the same value?

August 1st, 2022

Do we take gravity = 9.8 m/s² for all heights when solving problems? Why or why not?

August 1st, 2022

Is there an explanation for the 3:2:1 ratio between the electron, up and down quark electric charges?

August 1st, 2022

Can the accuracy in Planck's constant ever be increased?

August 1st, 2022

What constant varies in the fine structure constant?

September 1st, 2020

Why can you remove the gravitational constant from a computer game simulation?

February 2nd, 2020

Can Planck's constant be derived from Maxwell's equations?

August 1st, 2022

Physical Significance of the Planck Density

August 1st, 2022

Is there a relationship between the Cosmological constant and the Hubble constant?

August 1st, 2022

Can someone explain Planck's constant simply?

December 6th, 2020

How is "little $h$" measured in cosmology? The dimensionless parameter from the Hubble constant, $H_0$

August 1st, 2022

Is the Planck length the limit below which our physics does not make sense? And if so, why is that true?

March 30th, 2020

How can Planck units be consistent with conflicting dimensions of mass?

January 31st, 2020

Why are $\mu_0$ and $\epsilon_0$, which appear in electrostatics and magnetostatics, related to the speed of light which appears in electrodynamics?

July 26th, 2020

Why is the string length around the Planck length?

March 23rd, 2022

Is the Bohr radius deprecated?

June 21st, 2020

Why is there a constant in the ideal gas law?

April 18th, 2020

Is speed of light and sound rational or irrational in nature?

January 23rd, 2020

Gravitational constant in higher dimensions?

August 1st, 2022

What's keeping us from simply redefining Avogadro's Number / the Mole as a definite integer?

September 28th, 2020

Is the fine-structure constant a parameter of the standard model?

August 1st, 2022

Why does the fine-structure constant $α$ have the value it does?

January 23rd, 2021

Has the speed of light changed over time?

April 24th, 2020