From 03abe02aca18c0d38c64a3c33b9fd025a86dc891 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mos=C3=A8=20Giordano?= <mose@gnu.org>
Date: Sun, 19 Jul 2020 00:32:31 +0100
Subject: [PATCH] Add characteristic impedance of vacuum to CODATA2018

---
 src/codata2018.jl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/codata2018.jl b/src/codata2018.jl
index cdea5cd..0cbf6ee 100644
--- a/src/codata2018.jl
+++ b/src/codata2018.jl
@@ -105,5 +105,8 @@ _νx(T) = find_zero((_νf, _Dνf), T(_νx0), Roots.Newton())
                   ustrip(_νx(BigFloat) * big(k_B) / big(h)), Hz / K,
                   _νx0 * measurement(k_B) / measurement(h),
                   _νx(BigFloat) * measurement(BigFloat, k_B) / measurement(BigFloat, h), "CODATA 2018")
+@constant(CharacteristicImpedanceOfVacuum, Z_0, "Characteristic impedance of vacuum",
+          376.730_313_668, BigFloat(376_730_313_668)/BigFloat(1000_000_000), Ω, 5.7e-8,
+          BigFloat(57) / BigFloat(1000_000_000), "CODATA 2018")
 
 end # module CODATA2018