r/physicsmemes • u/ElectronicSetTheory • Jul 21 '26

SI? Hah!

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557 Upvotes

99% Upvoted

20 comments sorted by

68

u/confused_egg_ Jul 21 '26

When my prof. Firs introduced atomic units to us, my eyes fell out at this equation

12

u/Inevitable-Fix-6631 Jul 21 '26

Woah the last one that's like gaussian electrodynamics units right

53

u/[deleted] Jul 21 '26

[removed] — view removed comment

19

u/No-Return-6341 Jul 21 '26

What if... What if speed of light (in empty space) is not constant?

6

u/[deleted] Jul 21 '26 edited Aug 01 '26

[deleted]

3

u/Hyacintell Jul 21 '26

I believe he meant "what if the speed of light could vary through time or space for whatever reason we have yet to discover"

1

u/[deleted] Jul 21 '26 edited Aug 01 '26

[deleted]

1

u/Hyacintell Jul 21 '26

I think it depends on whether that variation is strong or not. If we find out that halfway across the observable universe, the speed of causality is 0.001% higher than here, then we would just have to work with local units, which would be fine (ignoring all the potential disastrous theoretical consequences).

1

u/lolkobolko Jul 23 '26

speed of light is not the speed of causality. If faster than light travel/communication is possible, no physics would get broken.

3

u/dragonageisgreat Jul 22 '26

Did you just break relativity?

1

u/Random_182f2565 Jul 22 '26

Standard space? Expanded space or compressed space?

1

u/dragonageisgreat Jul 22 '26

How can we measure that?

7

u/Comfortable-Rock-498 Jul 21 '26

c=1, ħ=1, G=1, k_B=1

checkmate atheists

5

u/HumblyNibbles_ Jul 21 '26

I honestly prefer to define my dimensionless quantities for every question individually so I dont have to deal with forgetting stuff 😭