I came across this by chance the other day, and felt that this is a particularly good explanation of the meaning of “metric” in the context of GR, so I thought I’d share it here for whoever is interested:

Some nice visualisations in there. Also, the other GR-related videos on this particular channel are quite good.

No particular point for discussion, I’m simply sharing this for all those who wish to learn more about this subject without having to dive too deeply into the abstract maths. Particular emphasis on comments from time stamp 19:40 onwards (on coordinate vs proper measurements), as that’s were all those many common misconceptions arise.

EDIT: Apologies, I’m just after realising that there’s an open thread for posting YouTube science content:

Moderators, feel free to merge my comment there, if necessary.

Edited December 18, 20223 yr by Markus Hanke

Thanks Markus.