40d Talk:Temperature

How hot does fire burn? Random832 16:20, 13 November 2008 (EST)

To burn, an object needs to be heated to a certain temperature. While burning, the object will generate more and more heat until it's spent. The heat will dissipate normally, which can raise the temperature nearby enough to ignite other objects. The hotter something is, the faster it burns. When an object is all burned up, it no longer generates heat. some types of ashes can start burning again if heated even more.

This is why kindling, which is easy to ignite, is used to set other things on fire. It's also why this can be so difficult to do--a burning tree will ignore nearby clothes, which burn hotter and faster than the tree does, but will not bones. (I even tried lighting all the other plants and trees on fire, and I still couldn't get the bones to start burning. Grass burns very hot fast, generating a lot of heat that dissipates just as quickly. Mine fires burn cooler and slower, to the point the coal could possibly be better described as 'roasting'. The heat does not dissipate easily, however, and can be very dangerous. I can't really answer your question, and I'm not totally sure the model I described is accurate, but I hope this explanation helps anyway. --Navian 16:38, 13 November 2008 (EST)

I was hoping for specific in-game temperatures e.g. to make a material that will melt if on a tile that is on fire. Also, what happens to an object that melts in open air (rather than in magma) and then is allowed to cool back down? Random832 02:36, 21 November 2008 (EST)

Materials without specific melting points can still melt. This means there is some default melting point (resp. boiling point) value assigned to materials that don't specify it. VengefulDonut 20:17, 20 November 2008 (EST)

Searching for the default melting point

I plan to search for the default melting point (by setting my adventurer to FIXED_TEMP at various levels and seeing at what point rocks melt) - as a baseline, does anyone know if a magma man (temp 12,000) will melt ordinary stone? We know magma itself (temp 12,568) will. Also, what's the basis for the claim that magma's temperature is 12568? Random832 02:42, 21 November 2008 (EST)

When I use Dtil to examine tiles containing magma, it lists a temperature of exactly 12000. I'm not sure if this is an issue of outdated information or dtil adjusting values. By comparison, excavated underground tiles have a temperature of 10015, and outdoor tiles currently vary from 10051 to 10056 (early Autumn, and I'm in a Temperate climate where water neither evaporates nor freezes). --Quietust 00:06, 23 August 2009 (UTC)

As a further test, I dropped some pig iron bars (which have a melting point of 12106) into some magma and let them sit in there for about a month. They never melted. I can only assume that the tests that led to the conclusion of magma's temperature being 12568 were performed incorrectly. --Quietust 21:09, 20 October 2009 (UTC)

In one final test, I lowered Iron's melting point to 12001 and confirmed that all of the goblinite in my magma pipe was still solid. Upon dropping its melting point to 12000, all of the goblinite instantly melted. I'd say the number 12568 is either from an old version or is entirely bogus. --Quietust 21:13, 20 October 2009 (UTC)

Just did a bunch of tests with dtil, and was able to conclude that ordinary stone melts at exactly 11500 and boils at exactly 14000 (modded a stone to have [SPEC_HEAT:1] so it would heat up to the ambient temperature as quickly as possible). --Quietust 22:10, 6 November 2009 (UTC)

...as is indicated directly in "file changes.txt", apparently since version 0.22.120.23b. Of course, it also lists default melting points for gems which would suggest that all gemstones (aside from diamonds) are magma-safe (melting at 12268 and boiling at 14368), even though this is clearly not the case in 0.28.181.40d. --Quietust 21:18, 24 November 2009 (UTC)

Coal Fires

Stupid Coal Tricks

DF: Temp check in game?

Is it possible to check the current temp from inside a Dwarf Fortress main game?Kenji 03 15:03, 18 July 2009 (UTC)

Hardcoded temperatures

While items made of WOOD, STONE, METAL, BONE, LEATHER, SILK, and PLANT (cloth) can have all of their various materials configured via raws, most other materials have hardcoded temperatures in this version. Temperatures which are not listed below are assumed to be NONE:

• IVORY / HORN - same temperatures as BONE
• AMBER - HEATDAM 11000, SPEC 1000
• CORAL / PEARL / SHELL - HEATDAM 10600, SPEC 1000
• GLASS_GREEN / GLASS_CLEAR / GLASS_CRYSTAL - MELT 13600, BOIL 16000, SPEC 700
• SAND (unused) - MELT 13600, BOIL 16000, no IGNITE/HEATDAM/COLDDAM, SPEC 835
• WATER / LYE / PLANT_ALCOHOL - MELT 10000, BOIL 10180, SPEC 4181
• COAL - BOIL 16708, IGNITE 11440, SPEC 409
• POTASH / ASH / PEARLASH / MUD / GRIME - SPEC 800
• RENDERED_FAT / FAT - MELT 10180, BOIL 10360, IGNITE 10180, SPEC 4181
• SOAP_ANIMAL - MELT 10180, BOIL 10360, SPEC 800
• VOMIT / BLOOD_NONSPECIFIC / SLIME / BLOOD_SPECIFIC / FILTH_B / FILTH_Y / UNKNOWN_SUBSTANCE - MELT 10000, BOIL 10180, HEATDAM 10180, SPEC 4181
• SALT - MELT 11442, BOIL 12637, SPEC 854

--Quietust (talk) 20:49, 3 June 2022 (UTC)