Add Stefan-Boltzmann constant to calc units table.

* lisp/calc/calc-units.el (math-standard-units):
Add Stefan-Boltzmann constant.

1 files changed, 2 insertions, 0 deletions

diff --git a/lisp/calc/calc-units.el b/lisp/calc/calc-units.el
index 59599608d6a..ea711ce3b95 100644
--- a/lisp/calc/calc-units.el
+++ b/lisp/calc/calc-units.el
@@ -279,6 +279,8 @@
               "10973731.568527 /m (*)")
     ( k       "1.3806504*10^(-23) J/K"      "Boltzmann's constant" nil
               "1.3806504 10^-23 J/K (*)")
+    ( σ       "5.670367*10^(-8) W/(m^2 K^4)" "Stefan-Boltzmann constant" nil
+              "5.670367 10^-8 W/(m^2 K^4) (*)")
     ( alpha   "7.2973525376*10^(-3)"        "Fine structure constant" nil
               "7.2973525376 10^-3 (*)")
     ( α       "alpha"                        "Fine structure constant" nil