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Difference between revisions of "v0.31:Temperature"

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{{quality|Fine|08:00, 22 May 2010 (UTC)}}''For temperature as it relates to choosing an embarkation site, see [[DF2010:Climate|Climate]].''
+
{{quality|Fine|15:51 27 December 2011 (UTC)}}{{av}}
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<br />{{AV}}
+
 
 +
''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 [[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.
  
−
[[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".
  
 
===Conversion===
 
===Conversion===
Line 16: Line 20:
  
 
[DF scale] = [RANKINE] + 9508.33
 
[DF scale] = [RANKINE] + 9508.33
 +
 +
''(Note: Mod-makers may find this [http://www.bay12forums.com/smf/index.php?topic=80523.0 Temperature Conversion Utility] handy if they find themselves having to convert a lot of temperatures to and/or from Degrees Urist.)''
  
 
===Reference Chart===
 
===Reference Chart===
Line 27: Line 33:
 
! Kelvin
 
! Kelvin
 
! Rankine
 
! Rankine
 +
 +
|-
 +
| Boiling Point of Water
 +
| 10180
 +
| 212
 +
| 100
 +
| 373.15
 +
| 671.67
 +
 +
|-
 +
|Human Body Temperature
 +
| 10066.6<sup>2</sup>
 +
| 98.6
 +
| 37.0
 +
| 310.15
 +
| 558.27
  
 
|-
 
|-
Line 35: Line 57:
 
| 273.15
 
| 273.15
 
| 491.67
 
| 491.67
−
 
−
|-
 
−
| Boiling Point of Water
 
−
| 10180
 
−
| 212
 
−
| 100
 
−
| 373.15
 
−
| 671.67
 
  
 
|-
 
|-
 
| Absolute Zero
 
| Absolute Zero
−
| 9508.33
+
| 9508.33<sup>2</sup>
 
| -459.67
 
| -459.67
 
| −273.15
 
| −273.15
Line 53: Line 67:
  
 
|-
 
|-
−
| DF Scale's Zero
+
| DF Scale's Zero<sup>1</sup>
 
| 0
 
| 0
 
| -9968
 
| -9968
Line 59: Line 73:
 
| -5282.40555...
 
| -5282.40555...
 
| -9508.33
 
| -9508.33
 +
|}
 +
 +
<small>
 +
:<sup>1</sup> - Yes, temperatures in Dwarf Fortress can go '''far, far''' below absolute zero, which is physically impossible. Considering Dwarf Fortress also allows [[water wheel#Perpetual motion|perpetual motion]], it's best not to ask questions.
 +
:<sup>2</sup> - 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.
 +
</small>
 +
 +
Some general information about temperatures in DF (copied from somewhere on the forums):
 +
{| class="prettytable"
 +
|-
 +
! 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==
 
==Melting point==
  
−
This is the temperature at which an object will melt. Any material with a melting point over 12,000°U is {{L|magma-safe}}.
+
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==
 +
 
 +
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==
 +
 
 +
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.
−
<br /><br />
+
 
 +
==Fixed temperature==
 +
 
 +
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'' {{ct|10000}}.
 +
 
 +
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

xTATTEREDx  · +FINE+  · *SUPERIOR*  · ≡EXCEPTIONAL≡  · ☼MASTERWORK☼
v50.14 · v0.47 · v0.34 · v0.31.25 · v0.28 · v0.23
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.

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