From f1dc72bcf1092b5187dd379e4b130de92d1102f7 Mon Sep 17 00:00:00 2001
From: Lars Bilke <lars.bilke@ufz.de>
Date: Mon, 14 Jun 2021 10:48:47 +0200
Subject: [PATCH] Fixing dead URL.

---
 MaterialLib/PhysicalConstant.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/MaterialLib/PhysicalConstant.h b/MaterialLib/PhysicalConstant.h
index 3b028a7ac59..cfdd1f8a388 100644
--- a/MaterialLib/PhysicalConstant.h
+++ b/MaterialLib/PhysicalConstant.h
@@ -24,7 +24,7 @@ constexpr double CelsiusZeroInKelvin = 273.15;
 /**
   Ideal gas constant in SI standard units (J \per{mol} \per{K})
 
-  - Source:               http://physics.nist.gov/cgi-bin/cuu/Value?r
+  - Source:               https://web.archive.org/web/20210603224431/https://physics.nist.gov/cgi-bin/cuu/Value?r
   - Date visited:         2015-04-17
   - Standard uncertainty: 0.000 0075 J mol^-1 K^-1
 */
-- 
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