From c7e4f20f02871641bb5cc00da7dbc4d7fe3c0d12 Mon Sep 17 00:00:00 2001
From: Sarah C <93578146+SapphicOverload@users.noreply.github.com>
Date: Tue, 13 Jan 2026 17:16:09 -0500
Subject: [PATCH] Fix tritium fires breaking conservation of mass (#41870)

* i can't believe this went unnoticed for so long

* i may be stupid
---
 Content.Server/Atmos/Reactions/TritiumFireReaction.cs | 7 ++++---
 Content.Shared/Atmos/Atmospherics.cs                  | 1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/Content.Server/Atmos/Reactions/TritiumFireReaction.cs b/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
index 8b7d4e4872..45443b5a86 100644
--- a/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
+++ b/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
@@ -27,12 +27,13 @@ namespace Content.Server.Atmos.Reactions
                     burnedFuel = initialTrit;
 
                 mixture.AdjustMoles(Gas.Tritium, -burnedFuel);
+                mixture.AdjustMoles(Gas.Oxygen, -burnedFuel / Atmospherics.TritiumBurnFuelRatio);
             }
             else
             {
-                burnedFuel = initialTrit;
-                mixture.SetMoles(Gas.Tritium, mixture.GetMoles(Gas.Tritium ) * (1 - 1 / Atmospherics.TritiumBurnTritFactor));
-                mixture.AdjustMoles(Gas.Oxygen, -mixture.GetMoles(Gas.Tritium));
+                burnedFuel = Math.Max(initialTrit, mixture.GetMoles(Gas.Oxygen) / Atmospherics.TritiumBurnFuelRatio) / Atmospherics.TritiumBurnTritFactor;
+                mixture.AdjustMoles(Gas.Tritium, -burnedFuel);
+                mixture.AdjustMoles(Gas.Oxygen, -burnedFuel / Atmospherics.TritiumBurnFuelRatio);
                 energyReleased += (Atmospherics.FireHydrogenEnergyReleased * burnedFuel * (Atmospherics.TritiumBurnTritFactor - 1));
             }
 
diff --git a/Content.Shared/Atmos/Atmospherics.cs b/Content.Shared/Atmos/Atmospherics.cs
index 80ad36e904..7b9b106c54 100644
--- a/Content.Shared/Atmos/Atmospherics.cs
+++ b/Content.Shared/Atmos/Atmospherics.cs
@@ -240,6 +240,7 @@ namespace Content.Shared.Atmos
 
         public const float TritiumBurnOxyFactor = 100f;
         public const float TritiumBurnTritFactor = 10f;
+        public const float TritiumBurnFuelRatio = 2f;
 
         public const float FrezonCoolLowerTemperature = 23.15f;
 
-- 
2.52.0