diff --git a/Content.Server/Atmos/Components/GasMixtureHolderComponent.cs b/Content.Server/Atmos/Components/GasMixtureHolderComponent.cs
index 9d533f6ec4d..98feb433468 100644
--- a/Content.Server/Atmos/Components/GasMixtureHolderComponent.cs
+++ b/Content.Server/Atmos/Components/GasMixtureHolderComponent.cs
@@ -1,4 +1,6 @@
-namespace Content.Server.Atmos.Components
+using Content.Shared.Atmos;
+
+namespace Content.Server.Atmos.Components
 {
     [RegisterComponent]
     public sealed partial class GasMixtureHolderComponent : Component, IGasMixtureHolder
diff --git a/Content.Server/Atmos/Components/MapAtmosphereComponent.cs b/Content.Server/Atmos/Components/MapAtmosphereComponent.cs
index 6bdef901d44..bdd05e78494 100644
--- a/Content.Server/Atmos/Components/MapAtmosphereComponent.cs
+++ b/Content.Server/Atmos/Components/MapAtmosphereComponent.cs
@@ -1,3 +1,4 @@
+using Content.Shared.Atmos;
 using Content.Shared.Atmos.Components;
 using Content.Shared.Atmos.EntitySystems;
 
diff --git a/Content.Server/Atmos/EntitySystems/AtmosExposedSystem.cs b/Content.Server/Atmos/EntitySystems/AtmosExposedSystem.cs
index 9590b9aa548..39469e993f0 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosExposedSystem.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosExposedSystem.cs
@@ -1,3 +1,4 @@
+using Content.Shared.Atmos;
 using Robust.Shared.Map;
 
 namespace Content.Server.Atmos.EntitySystems
diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.API.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.API.cs
index 614d550c2f7..df31db6ba07 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.API.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.API.cs
@@ -1,10 +1,10 @@
 using System.Linq;
 using Content.Server.Atmos.Components;
 using Content.Server.Atmos.Piping.Components;
-using Content.Server.Atmos.Reactions;
 using Content.Server.NodeContainer.NodeGroups;
 using Content.Shared.Atmos;
 using Content.Shared.Atmos.Components;
+using Content.Shared.Atmos.Reactions;
 using Robust.Shared.Map.Components;
 using Robust.Shared.Utility;
 
diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs
index f8ee4f41923..70c4639e481 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs
@@ -2,6 +2,7 @@ using System.Linq;
 using System.Runtime.CompilerServices;
 using Content.Server.Atmos.Reactions;
 using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using Robust.Shared.Prototypes;
 using DependencyAttribute = Robust.Shared.IoC.DependencyAttribute;
 
diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.GridAtmosphere.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.GridAtmosphere.cs
index 4b9ef49a406..3830745f68c 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.GridAtmosphere.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.GridAtmosphere.cs
@@ -2,6 +2,7 @@ using Content.Server.Atmos.Components;
 using Content.Server.Atmos.Reactions;
 using Content.Shared.Atmos;
 using Content.Shared.Atmos.Components;
+using Content.Shared.Atmos.Reactions;
 using Robust.Shared.Map;
 using Robust.Shared.Map.Components;
 using Robust.Shared.Utility;
diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
index 7163b4cd44c..db952237338 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
@@ -2,6 +2,7 @@ using Content.Server.Atmos.Components;
 using Content.Server.Atmos.Reactions;
 using Content.Shared.Atmos;
 using Content.Shared.Atmos.Components;
+using Content.Shared.Atmos.Reactions;
 using Content.Shared.Audio;
 using Content.Shared.Database;
 using Robust.Shared.Audio;
diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Map.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Map.cs
index 25b3b801f76..4b77d9c70da 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Map.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Map.cs
@@ -1,4 +1,5 @@
 using Content.Server.Atmos.Components;
+using Content.Shared.Atmos;
 using Content.Shared.Atmos.Components;
 using Robust.Shared.GameStates;
 using Robust.Shared.Map.Components;
diff --git a/Content.Server/Atmos/IGasMixtureHolder.cs b/Content.Server/Atmos/IGasMixtureHolder.cs
index 96efa6b9836..65d7ba69a76 100644
--- a/Content.Server/Atmos/IGasMixtureHolder.cs
+++ b/Content.Server/Atmos/IGasMixtureHolder.cs
@@ -1,4 +1,6 @@
-namespace Content.Server.Atmos
+using Content.Shared.Atmos;
+
+namespace Content.Server.Atmos
 {
     public interface IGasMixtureHolder
     {
diff --git a/Content.Server/Atmos/IGasReactionEffect.cs b/Content.Server/Atmos/IGasReactionEffect.cs
index bd229694bb1..9fc9231908c 100644
--- a/Content.Server/Atmos/IGasReactionEffect.cs
+++ b/Content.Server/Atmos/IGasReactionEffect.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos.EntitySystems;
-using Content.Server.Atmos.Reactions;
+using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 
 namespace Content.Server.Atmos
 {
diff --git a/Content.Server/Atmos/Piping/Binary/Components/GasPortComponent.cs b/Content.Server/Atmos/Piping/Binary/Components/GasPortComponent.cs
index fb7ee6d5cf9..315362383c3 100644
--- a/Content.Server/Atmos/Piping/Binary/Components/GasPortComponent.cs
+++ b/Content.Server/Atmos/Piping/Binary/Components/GasPortComponent.cs
@@ -1,3 +1,5 @@
+using Content.Shared.Atmos;
+
 namespace Content.Server.Atmos.Piping.Binary.Components
 {
     [RegisterComponent]
diff --git a/Content.Server/Atmos/Portable/PortableScrubberSystem.cs b/Content.Server/Atmos/Portable/PortableScrubberSystem.cs
index 91ee5880574..bc5db2e22cb 100644
--- a/Content.Server/Atmos/Portable/PortableScrubberSystem.cs
+++ b/Content.Server/Atmos/Portable/PortableScrubberSystem.cs
@@ -13,6 +13,7 @@ using Content.Server.NodeContainer.NodeGroups;
 using Content.Server.Audio;
 using Content.Server.Administration.Logs;
 using Content.Server.NodeContainer.EntitySystems;
+using Content.Shared.Atmos;
 using Content.Shared.Database;
 
 namespace Content.Server.Atmos.Portable
diff --git a/Content.Server/Atmos/Reactions/AmmoniaOxygenReaction.cs b/Content.Server/Atmos/Reactions/AmmoniaOxygenReaction.cs
index 197034ce545..2c071afab1e 100644
--- a/Content.Server/Atmos/Reactions/AmmoniaOxygenReaction.cs
+++ b/Content.Server/Atmos/Reactions/AmmoniaOxygenReaction.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using JetBrains.Annotations;
 
 namespace Content.Server.Atmos.Reactions;
diff --git a/Content.Server/Atmos/Reactions/FrezonCoolantReaction.cs b/Content.Server/Atmos/Reactions/FrezonCoolantReaction.cs
index 051ee8202db..475c149cf37 100644
--- a/Content.Server/Atmos/Reactions/FrezonCoolantReaction.cs
+++ b/Content.Server/Atmos/Reactions/FrezonCoolantReaction.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using JetBrains.Annotations;
 
 namespace Content.Server.Atmos.Reactions;
diff --git a/Content.Server/Atmos/Reactions/FrezonProductionReaction.cs b/Content.Server/Atmos/Reactions/FrezonProductionReaction.cs
index 4ffd9c2f5b3..e3d3ece6b6a 100644
--- a/Content.Server/Atmos/Reactions/FrezonProductionReaction.cs
+++ b/Content.Server/Atmos/Reactions/FrezonProductionReaction.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using JetBrains.Annotations;
 
 namespace Content.Server.Atmos.Reactions;
diff --git a/Content.Server/Atmos/Reactions/GasReactionPrototype.cs b/Content.Server/Atmos/Reactions/GasReactionPrototype.cs
index 0ee29de3bf1..48a113bb9a2 100644
--- a/Content.Server/Atmos/Reactions/GasReactionPrototype.cs
+++ b/Content.Server/Atmos/Reactions/GasReactionPrototype.cs
@@ -1,22 +1,10 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using Robust.Shared.Prototypes;
 
 namespace Content.Server.Atmos.Reactions
 {
-    [Flags]
-    public enum ReactionResult : byte
-    {
-        NoReaction = 0,
-        Reacting = 1,
-        StopReactions = 2,
-    }
-
-    public enum GasReaction : byte
-    {
-        Fire = 0,
-    }
-
     [Prototype("gasReaction")]
     public sealed partial class GasReactionPrototype : IPrototype
     {
diff --git a/Content.Server/Atmos/Reactions/N2ODecompositionReaction.cs b/Content.Server/Atmos/Reactions/N2ODecompositionReaction.cs
index 7fce663dc31..367c0eb7b9c 100644
--- a/Content.Server/Atmos/Reactions/N2ODecompositionReaction.cs
+++ b/Content.Server/Atmos/Reactions/N2ODecompositionReaction.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using JetBrains.Annotations;
 
 namespace Content.Server.Atmos.Reactions;
diff --git a/Content.Server/Atmos/Reactions/PlasmaFireReaction.cs b/Content.Server/Atmos/Reactions/PlasmaFireReaction.cs
index e7ab7835fd9..98d567d4ed5 100644
--- a/Content.Server/Atmos/Reactions/PlasmaFireReaction.cs
+++ b/Content.Server/Atmos/Reactions/PlasmaFireReaction.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using JetBrains.Annotations;
 
 namespace Content.Server.Atmos.Reactions
diff --git a/Content.Server/Atmos/Reactions/TritiumFireReaction.cs b/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
index 7103859a90f..3ad0a4b04de 100644
--- a/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
+++ b/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using JetBrains.Annotations;
 
 namespace Content.Server.Atmos.Reactions
diff --git a/Content.Server/Atmos/Reactions/WaterVaporReaction.cs b/Content.Server/Atmos/Reactions/WaterVaporReaction.cs
index 8db8fdbd66d..e06c4b75ff9 100644
--- a/Content.Server/Atmos/Reactions/WaterVaporReaction.cs
+++ b/Content.Server/Atmos/Reactions/WaterVaporReaction.cs
@@ -1,5 +1,7 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Server.Fluids.EntitySystems;
+using Content.Shared.Atmos;
+using Content.Shared.Atmos.Reactions;
 using Content.Shared.Chemistry.Components;
 using Content.Shared.FixedPoint;
 using Content.Shared.Maps;
diff --git a/Content.Server/Atmos/Serialization/TileAtmosCollectionSerializer.cs b/Content.Server/Atmos/Serialization/TileAtmosCollectionSerializer.cs
index 00be83e86d9..5b30d65e48e 100644
--- a/Content.Server/Atmos/Serialization/TileAtmosCollectionSerializer.cs
+++ b/Content.Server/Atmos/Serialization/TileAtmosCollectionSerializer.cs
@@ -1,4 +1,5 @@
 using System.Globalization;
+using Content.Shared.Atmos;
 using Robust.Shared.Serialization;
 using Robust.Shared.Serialization.Manager;
 using Robust.Shared.Serialization.Markdown;
diff --git a/Content.Server/Atmos/TileMixtureEnumerator.cs b/Content.Server/Atmos/TileMixtureEnumerator.cs
index 20440032dab..5601615f509 100644
--- a/Content.Server/Atmos/TileMixtureEnumerator.cs
+++ b/Content.Server/Atmos/TileMixtureEnumerator.cs
@@ -1,4 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
+using Content.Shared.Atmos;
 
 namespace Content.Server.Atmos;
 
diff --git a/Content.Server/Botany/Systems/PlantHolderSystem.cs b/Content.Server/Botany/Systems/PlantHolderSystem.cs
index 721536a7c07..c8842e14939 100644
--- a/Content.Server/Botany/Systems/PlantHolderSystem.cs
+++ b/Content.Server/Botany/Systems/PlantHolderSystem.cs
@@ -6,6 +6,7 @@ using Content.Server.Fluids.Components;
 using Content.Server.Ghost.Roles.Components;
 using Content.Server.Kitchen.Components;
 using Content.Server.Popups;
+using Content.Shared.Atmos;
 using Content.Shared.Botany;
 using Content.Shared.Burial.Components;
 using Content.Shared.Chemistry.Reagent;
diff --git a/Content.Server/Destructible/Thresholds/Behaviors/SpawnGasBehavior.cs b/Content.Server/Destructible/Thresholds/Behaviors/SpawnGasBehavior.cs
index fec93a87f45..81fb07ecfc9 100644
--- a/Content.Server/Destructible/Thresholds/Behaviors/SpawnGasBehavior.cs
+++ b/Content.Server/Destructible/Thresholds/Behaviors/SpawnGasBehavior.cs
@@ -1,4 +1,5 @@
 using Content.Server.Atmos;
+using Content.Shared.Atmos;
 using JetBrains.Annotations;
 
 namespace Content.Server.Destructible.Thresholds.Behaviors;
diff --git a/Content.Server/Disposal/Unit/Components/DisposalHolderComponent.cs b/Content.Server/Disposal/Unit/Components/DisposalHolderComponent.cs
index 3df2182b41e..690b33968b0 100644
--- a/Content.Server/Disposal/Unit/Components/DisposalHolderComponent.cs
+++ b/Content.Server/Disposal/Unit/Components/DisposalHolderComponent.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos;
 using Content.Server.Disposal.Tube.Components;
+using Content.Shared.Atmos;
 using Robust.Shared.Containers;
 
 namespace Content.Server.Disposal.Unit.Components
diff --git a/Content.Server/Lathe/LatheSystem.cs b/Content.Server/Lathe/LatheSystem.cs
index f56737a5a5f..2b3b810fba7 100644
--- a/Content.Server/Lathe/LatheSystem.cs
+++ b/Content.Server/Lathe/LatheSystem.cs
@@ -8,6 +8,7 @@ using Content.Server.Materials;
 using Content.Server.Power.Components;
 using Content.Server.Power.EntitySystems;
 using Content.Server.Stack;
+using Content.Shared.Atmos;
 using Content.Shared.UserInterface;
 using Content.Shared.Database;
 using Content.Shared.Emag.Components;
diff --git a/Content.Server/Mech/Components/MechAirComponent.cs b/Content.Server/Mech/Components/MechAirComponent.cs
index c533b3d8343..d312e1b7399 100644
--- a/Content.Server/Mech/Components/MechAirComponent.cs
+++ b/Content.Server/Mech/Components/MechAirComponent.cs
@@ -1,4 +1,5 @@
 using Content.Server.Atmos;
+using Content.Shared.Atmos;
 
 namespace Content.Server.Mech.Components;
 
diff --git a/Content.Server/Medical/CryoPodSystem.cs b/Content.Server/Medical/CryoPodSystem.cs
index 71921f44fda..8d54fc6dd95 100644
--- a/Content.Server/Medical/CryoPodSystem.cs
+++ b/Content.Server/Medical/CryoPodSystem.cs
@@ -13,6 +13,7 @@ using Content.Server.NodeContainer.NodeGroups;
 using Content.Server.NodeContainer.Nodes;
 using Content.Server.Power.Components;
 using Content.Server.Temperature.Components;
+using Content.Shared.Atmos;
 using Content.Shared.UserInterface;
 using Content.Shared.Chemistry;
 using Content.Shared.Chemistry.Components;
diff --git a/Content.Server/Nutrition/EntitySystems/SmokingSystem.Vape.cs b/Content.Server/Nutrition/EntitySystems/SmokingSystem.Vape.cs
index fb56dffac96..f7650f599b4 100644
--- a/Content.Server/Nutrition/EntitySystems/SmokingSystem.Vape.cs
+++ b/Content.Server/Nutrition/EntitySystems/SmokingSystem.Vape.cs
@@ -13,6 +13,7 @@ using Content.Shared.IdentityManagement;
 using Content.Shared.Interaction;
 using Content.Shared.Nutrition;
 using System.Threading;
+using Content.Shared.Atmos;
 
 /// <summary>
 /// System for vapes
diff --git a/Content.Server/Power/Generation/Teg/TegSystem.cs b/Content.Server/Power/Generation/Teg/TegSystem.cs
index 3510a3da45d..540bd6c4832 100644
--- a/Content.Server/Power/Generation/Teg/TegSystem.cs
+++ b/Content.Server/Power/Generation/Teg/TegSystem.cs
@@ -7,6 +7,7 @@ using Content.Server.DeviceNetwork.Systems;
 using Content.Server.NodeContainer;
 using Content.Server.NodeContainer.Nodes;
 using Content.Server.Power.Components;
+using Content.Shared.Atmos;
 using Content.Shared.DeviceNetwork;
 using Content.Shared.Examine;
 using Content.Shared.Power.Generation.Teg;
diff --git a/Content.Server/Power/Generator/GeneratorExhaustGasSystem.cs b/Content.Server/Power/Generator/GeneratorExhaustGasSystem.cs
index cd85e67221c..359c31d75bb 100644
--- a/Content.Server/Power/Generator/GeneratorExhaustGasSystem.cs
+++ b/Content.Server/Power/Generator/GeneratorExhaustGasSystem.cs
@@ -1,5 +1,6 @@
 using Content.Server.Atmos;
 using Content.Server.Atmos.EntitySystems;
+using Content.Shared.Atmos;
 using Content.Shared.Power.Generator;
 
 namespace Content.Server.Power.Generator;
diff --git a/Content.Server/Storage/Components/EntityStorageComponent.cs b/Content.Server/Storage/Components/EntityStorageComponent.cs
index 40fdb1b3261..3fba89b64ab 100644
--- a/Content.Server/Storage/Components/EntityStorageComponent.cs
+++ b/Content.Server/Storage/Components/EntityStorageComponent.cs
@@ -1,4 +1,5 @@
 using Content.Server.Atmos;
+using Content.Shared.Atmos;
 using Content.Shared.Storage.Components;
 using Robust.Shared.GameStates;
 
diff --git a/Content.Server/Xenoarchaeology/XenoArtifacts/Effects/Systems/GasArtifactSystem.cs b/Content.Server/Xenoarchaeology/XenoArtifacts/Effects/Systems/GasArtifactSystem.cs
index e24d31a1135..dc054d23182 100644
--- a/Content.Server/Xenoarchaeology/XenoArtifacts/Effects/Systems/GasArtifactSystem.cs
+++ b/Content.Server/Xenoarchaeology/XenoArtifacts/Effects/Systems/GasArtifactSystem.cs
@@ -2,6 +2,7 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Server.Xenoarchaeology.XenoArtifacts.Effects.Components;
 using Content.Server.Xenoarchaeology.XenoArtifacts.Events;
+using Content.Shared.Atmos;
 
 namespace Content.Server.Xenoarchaeology.XenoArtifacts.Effects.Systems;
 
diff --git a/Content.Server/Xenoarchaeology/XenoArtifacts/Effects/Systems/TemperatureArtifactSystem.cs b/Content.Server/Xenoarchaeology/XenoArtifacts/Effects/Systems/TemperatureArtifactSystem.cs
index f314d4a4fb2..e62ce36b5b9 100644
--- a/Content.Server/Xenoarchaeology/XenoArtifacts/Effects/Systems/TemperatureArtifactSystem.cs
+++ b/Content.Server/Xenoarchaeology/XenoArtifacts/Effects/Systems/TemperatureArtifactSystem.cs
@@ -2,6 +2,7 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Server.Xenoarchaeology.XenoArtifacts.Effects.Components;
 using Content.Server.Xenoarchaeology.XenoArtifacts.Events;
+using Content.Shared.Atmos;
 using Robust.Server.GameObjects;
 
 namespace Content.Server.Xenoarchaeology.XenoArtifacts.Effects.Systems;
diff --git a/Content.Server/Atmos/GasMixture.cs b/Content.Shared/Atmos/GasMixture.cs
similarity index 98%
rename from Content.Server/Atmos/GasMixture.cs
rename to Content.Shared/Atmos/GasMixture.cs
index 3d73a4d0b16..a676ed67204 100644
--- a/Content.Server/Atmos/GasMixture.cs
+++ b/Content.Shared/Atmos/GasMixture.cs
@@ -1,13 +1,12 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Runtime.CompilerServices;
-using Content.Server.Atmos.Reactions;
-using Content.Shared.Atmos;
 using Content.Shared.Atmos.EntitySystems;
+using Content.Shared.Atmos.Reactions;
 using Robust.Shared.Serialization;
 using Robust.Shared.Utility;
 
-namespace Content.Server.Atmos
+namespace Content.Shared.Atmos
 {
     /// <summary>
     ///     A general-purpose, variable volume gas mixture.
diff --git a/Content.Shared/Atmos/GasMixtureStringRepresentation.cs b/Content.Shared/Atmos/GasMixtureStringRepresentation.cs
new file mode 100644
index 00000000000..942b2bdc672
--- /dev/null
+++ b/Content.Shared/Atmos/GasMixtureStringRepresentation.cs
@@ -0,0 +1,16 @@
+namespace Content.Shared.Atmos;
+
+public readonly record struct GasMixtureStringRepresentation(float TotalMoles, float Temperature, float Pressure, Dictionary<string, float> MolesPerGas) : IFormattable
+{
+    public override string ToString()
+    {
+        return $"{Temperature}K {Pressure} kPa";
+    }
+
+    public string ToString(string? format, IFormatProvider? formatProvider)
+    {
+        return ToString();
+    }
+
+    public static implicit operator string(GasMixtureStringRepresentation rep) => rep.ToString();
+}
diff --git a/Content.Shared/Atmos/Reactions/GasReactionEnums.cs b/Content.Shared/Atmos/Reactions/GasReactionEnums.cs
new file mode 100644
index 00000000000..73b8998d409
--- /dev/null
+++ b/Content.Shared/Atmos/Reactions/GasReactionEnums.cs
@@ -0,0 +1,14 @@
+namespace Content.Shared.Atmos.Reactions;
+
+[Flags]
+public enum ReactionResult : byte
+{
+    NoReaction = 0,
+    Reacting = 1,
+    StopReactions = 2,
+}
+
+public enum GasReaction : byte
+{
+    Fire = 0,
+}