v50 Steam/Premium information for editors
  • v50 information can now be added to pages in the main namespace. v0.47 information can still be found in the DF2014 namespace. See here for more details on the new versioning policy.
  • Use this page to report any issues related to the migration.
This notice may be cached—the current version can be found here.

Difference between revisions of "v0.31:Temperature"

From Dwarf Fortress Wiki
Jump to navigation Jump to search
(→‎Reference Chart: Re-ordered temps to be consistent)
m
 
(8 intermediate revisions by 2 users not shown)
Line 1: Line 1:
{{quality|Fine|08:00, 22 May 2010 (UTC)}}{{av}}
+
{{quality|Fine|15:51 27 December 2011 (UTC)}}{{av}}
  
''For temperature as it relates to choosing an embarkation site, see [[DF2010:Climate|Climate]].''
+
''For temperature as it relates to choosing an embarkation site, see [[Climate]].''
  
 
==Temperature scale==
 
==Temperature scale==
Dwarf Fortress uses its own temperature scale in most cases, often called "Degrees [[Main:Urist|Urist]]" on this wiki.
+
''Dwarf Fortress'' uses its own temperature scale in most cases, often called "Degrees [[Main:Urist|Urist]]" on this wiki.
 
So if you see something like [HOMEOTHERM:10067], don't be amazed.
 
So if you see something like [HOMEOTHERM:10067], don't be amazed.
  
[[Main:Magma|Magma]]'s temperature is 12,000° Urist.
+
For example, [[magma]]'s temperature is 12,000° Urist.
  
The highest possible temperature in Dwarf Fortress is 60,000°U - the temperature 60,001°U is used internally for temperatures which have been set to "NONE".
+
The highest possible temperature in ''Dwarf Fortress'' is 60,000°U - the temperature 60,001°U is used internally for temperatures which have been set to "NONE".
  
 
===Conversion===
 
===Conversion===
Line 110: Line 110:
 
| 10180 U
 
| 10180 U
 
|-
 
|-
| fire
+
| material is fire-safe
 
| 11000 U
 
| 11000 U
 
|-
 
|-
 
| common stone melts
 
| common stone melts
 
| 11500 U
 
| 11500 U
 +
|-
 +
| burning coal (max)
 +
| 11640 U
 
|-
 
|-
 
| magma
 
| magma
 
| 12000 U
 
| 12000 U
 
|-
 
|-
 +
| [[titan]]/[[forgotten beast]] fire
 +
| 14000 U
 +
|-
 +
| [[dragon]] fire
 +
| 50000 U
 
|}
 
|}
  
 
==Melting point==
 
==Melting point==
  
This is the temperature at which an object will melt.
+
This is the temperature at which the material will melt.
  
 
==Boiling point==
 
==Boiling point==
  
This is the temperature at which an object will evaporate.
+
This is the temperature at which the material will evaporate.
  
 
==Ignition point==
 
==Ignition point==
  
This is the temperature at which an object will catch fire.
+
This is the temperature at which the material will catch fire.
  
 
==Heat damage point==
 
==Heat damage point==
  
This is the temperature above which an object will begin to take heat [[wear|damage]]. Flammable items without a heat damage point (or with an exceptionally high one) will take damage very slowly, causing them to burn for about 9-10 months before disappearing.
+
This is the temperature above which the material will begin to take heat [[wear|damage]]. Burning items without a heat damage point (or with an exceptionally high one) will take damage very slowly, causing them to burn for a very long time (9 months and 16.8 days) before disappearing.
  
 
==Cold damage point==
 
==Cold damage point==
  
This is the temperature below which an object will begin to take frost [[wear|damage]].
+
This is the temperature below which the material will begin to take frost [[wear|damage]].
  
 
==Specific heat==
 
==Specific heat==
  
This determines how long it takes an object to heat up or cool down. An object with high specific heat will change temperature more slowly.
+
This determines how long it takes the material to heat up or cool down. A material with a high specific heat capacity will change temperature more slowly.
  
 
==Fixed temperature==
 
==Fixed temperature==
  
A substance's temperature can be forced to always be a certain value via the MAT_FIXED_TEMP [[material definition token]].  The only standard material which uses this is the [[nether-cap]], whose temperature is always at the melting point of water.  If a substance's temperature is fixed to between its cold damage point and its heat damage point then items made from that substance will never suffer cold/heat damage, unless it's [[dump]]ed into [[magma]] or [[water]].  This makes nether cap [[fire-safe]] and [[magma safe]], in spite of being [[wood]].
+
A material's temperature can be forced to always be a certain value via the MAT_FIXED_TEMP [[material definition token]].  The only standard material which uses this is [[nether-cap]] wood, whose temperature is always at the melting point of water.  If a material's temperature is fixed to between its cold damage point and its heat damage point, then items made from that material will never suffer cold/heat damage.  This makes nether-caps [[fire-safe]] and [[magma-safe]] despite being a type of [[wood]].
  
The fixed temperature of an item is set when the item comes into existence, so you can't change the MAT_FIXED_TEMP token to cause an existing item to melt/burn/etc.
+
Due to the way fixed temperature is handled, giving a material a fixed temperature will not cause its actual temperature to change accordingly - instead, its temperature will simply be permanently locked at whatever it was previously. Removing a material's fixed temperature, however, will cause all items made of it to heat or cool until reaching equilibrium with their surroundings.
  
The fixed temperature of a [[container]] has no effect on its contents, so you can't freeze [[water]] by putting it into a [[bucket]] made from nether cap.
+
The fixed temperature of a [[container]] does affect its contents, but you can't freeze [[water]] by putting it into a [[bucket]] made from nether-cap because water will not freeze until it cools ''below'' {{ct|10000}}.
  
The fixed temperature of a substance only affects items made from that substance.  For example, setting a type of rock to have a fixed temperature over its melting point won't cause walls made from that rock to instantly melt, cause ice walls adjacent to the rock walls to melt, or even cause them to be considered [[Main:warm stone|warm stone]].
+
The fixed temperature of an inorganic material has no effect on unmined walls made from that material, though boulders '''will''' take on that temperature as they are produced via mining.

Latest revision as of 16:35, 2 March 2022

This article is about an older version of DF.

For temperature as it relates to choosing an embarkation site, see Climate.

Temperature scale[edit]

Dwarf Fortress uses its own temperature scale in most cases, often called "Degrees Urist" on this wiki. So if you see something like [HOMEOTHERM:10067], don't be amazed.

For example, magma's temperature is 12,000° Urist.

The highest possible temperature in Dwarf Fortress is 60,000°U - the temperature 60,001°U is used internally for temperatures which have been set to "NONE".

Conversion[edit]

[DF scale] = [FAHRENHEIT] + 9968

[DF scale] = [CELSIUS] * 9/5 + 10000

[DF scale] = [KELVIN] * 9/5 + 9508.33

[DF scale] = [RANKINE] + 9508.33

(Note: Mod-makers may find this Temperature Conversion Utility handy if they find themselves having to convert a lot of temperatures to and/or from Degrees Urist.)

Reference Chart[edit]

Significance DF Scale Fahrenheit Celsius Kelvin Rankine
Boiling Point of Water 10180 212 100 373.15 671.67
Human Body Temperature 10066.62 98.6 37.0 310.15 558.27
Freezing Point of Water 10000 32 0 273.15 491.67
Absolute Zero 9508.332 -459.67 −273.15 0 0
DF Scale's Zero1 0 -9968 -5555.555... -5282.40555... -9508.33

1 - Yes, temperatures in Dwarf Fortress can go far, far below absolute zero, which is physically impossible. Considering Dwarf Fortress also allows perpetual motion, it's best not to ask questions.
2 - Technically, fractional/decimal temperatures are not possible in Dwarf Fortress, as they are stored as unsigned 16-bit integers. For instance, body temp for humans in the raws is rounded to 10067.

Some general information about temperatures in DF (copied from somewhere on the forums):

Event / location Temperature
alcohol freezes 9850 U
water freezes 10000 U
underground 10015 U
outside (varies) 10048 U
dwarf/human body temp 10067 U
floor above magma 10075 U
fat melts 10078 U
water boils 10180 U
material is fire-safe 11000 U
common stone melts 11500 U
burning coal (max) 11640 U
magma 12000 U
titan/forgotten beast fire 14000 U
dragon fire 50000 U

Melting point[edit]

This is the temperature at which the material will melt.

Boiling point[edit]

This is the temperature at which the material will evaporate.

Ignition point[edit]

This is the temperature at which the material will catch fire.

Heat damage point[edit]

This is the temperature above which the material will begin to take heat damage. Burning items without a heat damage point (or with an exceptionally high one) will take damage very slowly, causing them to burn for a very long time (9 months and 16.8 days) before disappearing.

Cold damage point[edit]

This is the temperature below which the material will begin to take frost damage.

Specific heat[edit]

This determines how long it takes the material to heat up or cool down. A material with a high specific heat capacity will change temperature more slowly.

Fixed temperature[edit]

A material's temperature can be forced to always be a certain value via the MAT_FIXED_TEMP material definition token. The only standard material which uses this is nether-cap wood, whose temperature is always at the melting point of water. If a material's temperature is fixed to between its cold damage point and its heat damage point, then items made from that material will never suffer cold/heat damage. This makes nether-caps fire-safe and magma-safe despite being a type of wood.

Due to the way fixed temperature is handled, giving a material a fixed temperature will not cause its actual temperature to change accordingly - instead, its temperature will simply be permanently locked at whatever it was previously. Removing a material's fixed temperature, however, will cause all items made of it to heat or cool until reaching equilibrium with their surroundings.

The fixed temperature of a container does affect its contents, but you can't freeze water by putting it into a bucket made from nether-cap because water will not freeze until it cools below 10000 °U .

The fixed temperature of an inorganic material has no effect on unmined walls made from that material, though boulders will take on that temperature as they are produced via mining.