On 10/28/2018 9:04 AM, John Clark wrote:
On Sun, Oct 28, 2018 at 11:44 AM Tomas Pales <[email protected]
<mailto:[email protected]>> wrote:
> /Why is it too hard to measure gravity for distances less than 1 mm?/
Because gravity is 10^36 times weaker than electromagnetism
This is because the comparison is to the gravitational attraction of
elementary particles, such as two protons. But the masses of elementary
particles like protons are not fundamental. They are massless except
for internal energy or for the small coupling to the Higgs field.
The/fundamental/ unit of mass is the Planck mass and when it is used the
force between two fundamental masses is 137 times greater than the EM
force between two unit charges.
Brent
and you'd need to measure the gravitational force between spheres less
than 1 mm in radius and that force is too small to detect with current
experimental techniques.
John K Clark
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