Adds defines for atmospherics tanks values

code/__defines/atmos.dm

@@ -86,3 +86,10 @@
 //Flags for zone sleeping
 #define ZONE_ACTIVE   1
 #define ZONE_SLEEPING 0
+
+// Defines how much of certain gas do the Atmospherics tanks start with. Values are in kpa per tile (assuming 20C)
+#define ATMOSTANK_NITROGEN      90000 // A lot of N2 is needed to produce air mix, that's why we keep 90MPa of it
+#define ATMOSTANK_OXYGEN        40000 // O2 is also important for airmix, but not as much as N2 as it's only 21% of it.
+#define ATMOSTANK_CO2           25000 // CO2 and PH are not critically important for station, only for toxins and alternative coolants, no need to store a lot of those.
+#define ATMOSTANK_PHORON        25000
+#define ATMOSTANK_NITROUSOXIDE  10000 // N2O doesn't have a real useful use, i guess it's on station just to allow refilling of sec's riot control canisters?

code/game/turfs/flooring/flooring_premade.dm

@@ -55,21 +55,21 @@
 
 /turf/simulated/floor/reinforced/nitrogen
 	oxygen = 0
-	nitrogen = 90000
+	nitrogen = ATMOSTANK_NITROGEN
 
 /turf/simulated/floor/reinforced/oxygen
-	oxygen = 50000
+	oxygen = ATMOSTANK_OXYGEN
 	nitrogen = 0
 
 /turf/simulated/floor/reinforced/phoron
 	oxygen = 0
 	nitrogen = 0
-	phoron = 25000
+	phoron = ATMOSTANK_PHORON
 
 /turf/simulated/floor/reinforced/carbon_dioxide
 	oxygen = 0
 	nitrogen = 0
-	carbon_dioxide = 25000
+	carbon_dioxide = ATMOSTANK_CO2
 
 /turf/simulated/floor/reinforced/n20
 	oxygen = 0
@@ -79,7 +79,7 @@
 	..()
 	sleep(-1)
 	if(!air) make_air()
-	air.adjust_gas("sleeping_agent", 10000)
+	air.adjust_gas("sleeping_agent", ATMOSTANK_NITROUSOXIDE)
 
 /turf/simulated/floor/cult
 	name = "engraved floor"