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Editing DF2014:Temperature
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Latest revision | Your text | ||
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:::: {{tt|[FAHRENHEIT]}} + 9968 | :::: {{tt|[FAHRENHEIT]}} + 9968 | ||
:::: {{tt|[RANKINE]}} + 9508.33 | :::: {{tt|[RANKINE]}} + 9508.33 | ||
− | |||
− | |||
Some reference numbers: | Some reference numbers: | ||
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! Significance | ! Significance | ||
! DF Scale | ! DF Scale | ||
− | |||
! Celsius (°C) | ! Celsius (°C) | ||
! Kelvin | ! Kelvin | ||
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| [[#Boiling point|Boiling point of water]] | | [[#Boiling point|Boiling point of water]] | ||
| 10180 | | 10180 | ||
− | |||
| 100°C | | 100°C | ||
| 373.15K | | 373.15K | ||
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| [[Creature token#H|Human body temperature]] | | [[Creature token#H|Human body temperature]] | ||
| 10067* | | 10067* | ||
− | |||
| 37°C | | 37°C | ||
| 310.15K | | 310.15K | ||
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| [[Water#Freezing point|Freezing point of water]] | | [[Water#Freezing point|Freezing point of water]] | ||
| 10000 | | 10000 | ||
− | |||
| 0°C | | 0°C | ||
| 273.15K | | 273.15K | ||
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| [[wikipedia:Ethanol (data page)|Freezing point of ≈89% ABV]] | | [[wikipedia:Ethanol (data page)|Freezing point of ≈89% ABV]] | ||
| 9850 | | 9850 | ||
− | |||
| −83.<span style="text-decoration:overline">3</span>°C | | −83.<span style="text-decoration:overline">3</span>°C | ||
| 189.81<span style="text-decoration:overline">6</span>K | | 189.81<span style="text-decoration:overline">6</span>K | ||
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| [[wikipedia:Absolute zero|Absolute zero]] | | [[wikipedia:Absolute zero|Absolute zero]] | ||
| 9508* | | 9508* | ||
− | |||
| −273.15°C | | −273.15°C | ||
| 0K | | 0K | ||
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| Zero degrees Urist | | Zero degrees Urist | ||
| 0 | | 0 | ||
− | |||
| −5555.<span style="text-decoration:overline">5</span>°C | | −5555.<span style="text-decoration:overline">5</span>°C | ||
| −5282.40<span style="text-decoration:overline">5</span>K | | −5282.40<span style="text-decoration:overline">5</span>K | ||
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* {{tt|[COLDDAM_POINT:#]}} — This is the temperature below which the material will begin to take frost [[wear|damage]]. | * {{tt|[COLDDAM_POINT:#]}} — This is the temperature below which the material will begin to take frost [[wear|damage]]. | ||
* {{tt|[SPEC_HEAT:#]}} — This determines how long it takes the material to heat up or cool down. A material with a high specific heat capacity will hold more heat and affect its surroundings more before cooling down or heating up to equilibrium. The input for this token is not temperature, but rather the [[wikipedia:Specific heat capacity|specific heat capacity]] of the material. | * {{tt|[SPEC_HEAT:#]}} — This determines how long it takes the material to heat up or cool down. A material with a high specific heat capacity will hold more heat and affect its surroundings more before cooling down or heating up to equilibrium. The input for this token is not temperature, but rather the [[wikipedia:Specific heat capacity|specific heat capacity]] of the material. | ||
− | * {{tt|[MAT_FIXED_TEMP | + | * {{tt|[MAT_FIXED_TEMP]}} — 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]]. |
Useful info: if an item's material has a FIXED_TEMP, its temperature will not change under any circumstances. What this means is that if you modify a material's fixed temperature, any existing items made from it will retain whatever temperature they had before the material was modified. | Useful info: if an item's material has a FIXED_TEMP, its temperature will not change under any circumstances. What this means is that if you modify a material's fixed temperature, any existing items made from it will retain whatever temperature they had before the material was modified. | ||
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==Temperature transfer== | ==Temperature transfer== | ||
− | Temperature transfer in ''Dwarf Fortress'' is fairly simple - | + | Temperature transfer in ''Dwarf Fortress'' is fairly simple - most temperature values have a whole part (in "degrees Urist") and a fraction part (which ranges from 0 to the material's SPEC_HEAT minus 1). Once per tick, the game calculates the relevant temperature difference (e.g. between the item itself and the tile in which it is located) and adds that to the fraction part, then adjusts the whole part until the fraction part is within range. For example, a piece of Lignite (which has SPEC_HEAT 409) at temperature 10015.0 (room temperature underground) exposed to Magma (temperature 12000) will heat up by 1985 fraction units, which will increase its temperature to 10019.349. In order to reach its ignition point of 11440, it would need to be in the magma for a total of 517 ticks, over 5 seconds at 100 fps. |
==Bugs== | ==Bugs== | ||
* Temperature calculations are a known cause of lag. If [[maximizing framerate]] is a concern, you can disable temperature calculations through an option in [[D init.txt]]. With temperature calculations disabled, effects such as water freezing, melting, or evaporating, or creatures and items taking temperature-related damage will not occur. | * Temperature calculations are a known cause of lag. If [[maximizing framerate]] is a concern, you can disable temperature calculations through an option in [[D init.txt]]. With temperature calculations disabled, effects such as water freezing, melting, or evaporating, or creatures and items taking temperature-related damage will not occur. | ||
* When temperature calculations are disabled, dwarves will refuse to set foot in a cast [[obsidian]] tile (or any other tiles previously occupied by [[magma]]).{{bug|8391}} Occasionally, this can also occur when temperature calculations are still enabled. {{bug|1272}} | * When temperature calculations are disabled, dwarves will refuse to set foot in a cast [[obsidian]] tile (or any other tiles previously occupied by [[magma]]).{{bug|8391}} Occasionally, this can also occur when temperature calculations are still enabled. {{bug|1272}} |