Up until 2019, it sort of was, via the magnetic constant mu_0 = 4 pi x 10^-7 H/m...

		mitthrowaway2 on March 14, 2025 \| parent \| context \| favorite \| on: How Pi Almost Wasn't Up until 2019, it sort of was, via the magnetic constant mu_0 = 4 pi x 10^-7 H/m exactly. Unfortunately the 2019 revision of SI redefined it.