Road Flare: Difference between revisions

Road Flare
Properties
Stacks	20x
Recipe
Created With	Fabricator, Tool Manufacturer
Cost	1g Iron Ingot
	v; t; e;

← Older edit

Latest revision as of 17:39, 8 March 2026

Description

Road Flares are part of the Starting Gear. They burn for a short period of time and give out a distinct red glow in a small area. In a zero atmosphere environment, a road flare burns for approximately 5 minutes and 5 seconds. Further testing required for different environments/configuration.

Flares can be painted with Spray Paint to change their color, loaded as ammunition on the Flare Gun's internal magazine, and placed inside the Portable Gas Tank's canister slot to ignite combustible mixtures stored inside.

Use

Hold right click with it selected on-hand to light it. They are throwable holding Q. It can generate heat and could be use as a cheap heat source to heat up a room or portable gas tank. Beware as it can ignite combustible mixtures present around it! If this is a concern, consider using a Chem Light instead.

The total heat energy of one road flare used to be 600kJ. However, current testing suggests that road flares no longer release any signficant heat (>5kJ), though may still ignite fuel mixtures in rooms.

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-== Description == <!--T:2-->
+== Description ==
-[[Road Flare | Road Flares]] are part of the [[Starting Gear| Starting Gear]] and are found scattered around the spawn area. They burn for a short period of time and give out a distinct red glow in a small area. In a zero atmosphere environment, a road flare burns for approximately 5 minutes and 5 seconds. Further testing required for different environments/configuration.
+[[Road Flare | Road Flares]] are part of the [[Starting Gear| Starting Gear]]. They burn for a short period of time and give out a distinct red glow in a small area. In a zero atmosphere environment, a road flare burns for approximately 5 minutes and 5 seconds. Further testing required for different environments/configuration.
-== Use == <!--T:3-->
+Flares can be painted with [[Spray Paint]] to change their color, loaded as ammunition on the [[Flare Gun]]'s internal magazine, and placed inside the [[Portable Gas Tank]]'s canister slot to ignite combustible mixtures stored inside.
-Press O to toggle the flare light on or off. (O might not be true) Hold right click to light it. They are throwable holding Q.
-It can generate heat and could be use as a cheap heat source to heat up a room.
-Beware it could ignite H2 if both H2 and O2 exists in the room!
-The total heat energy of one road flare is 600kJ. Volume is constant in sealed rooms (8m^3 per one cube), as well as amount of matter, therefore only temperature and pressure are changed with heat energy, which is isochoric process. The equation for isochoric process is Q = Cv·n·ΔT, where Q stands for heat energy, Cv is molar heat capacity, n is amount of matter (in moles) and T is temperature. As a reference, one cubic volume of air (oxygen & nitrogen) at 100kPa and 20C has around 357 moles.
+== Use ==
-For example, with oxygen that means that one flare per one cubic volume can raise from -66C and 70kPa to 20C and 100kPa. From 20C and 100kPa one flare per cubic volume would raise temperature to 106C and pressure to 129kPa.
+Hold right click with it selected on-hand to light it. They are throwable holding Q.
+It can generate heat and could be use as a cheap heat source to heat up a room or portable gas tank.
+Beware as it can ignite combustible mixtures present around it! If this is a concern, consider using a [[Chem Light]] instead.
-Interestingly, this makes iron a theoretically better energy source than coal in [[Solid Fuel Generator | Solid Fuel Generator]] as 1 unit of coal generate 200kJ of energy and 1 road flare costs 1 iron. This depends on iron ore to iron conversion efficiency, and road flare to energy conversion method, and solid fuel generator heat energy output. Further testing required.
+The total heat energy of one road flare used to be 600kJ. However, current testing suggests that road flares no longer release any signficant heat (>5kJ), though may still ignite fuel mixtures in rooms.
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