Add maximum atmos temperature limit (#22882)

* Add Tmax

* Increase Tmax

Content.Shared/Atmos/Atmospherics.cs

@@ -45,6 +45,15 @@ namespace Content.Shared.Atmos
         /// </summary>
         public const float T20C = 293.15f;
 
+        /// <summary>
+        ///     Do not allow any gas mixture temperatures to exceed this number. It is occasionally possible
+        ///     to have very small heat capacity (e.g. room that was just unspaced) and for large amounts of
+        ///     energy to be transferred to it, even for a brief moment. However, this messes up subsequent
+        ///     calculations and so cap it here. The physical interpretation is that at this temperature, any
+        ///     gas that you would have transforms into plasma.
+        /// </summary>
+        public const float Tmax = 200e3f;
+
         /// <summary>
         ///     Liters in a cell.
         /// </summary>