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Difference between revisions of "Density"

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{{Material properties}}
 
{{Material properties}}
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'''Density''' is a [[material]] property that, along with the volume of the object, affects the [[weight]] of an object made from the [[material]].
+
'''Density''' is a [[material]] property that, along with volume, affects the [[weight]]/mass of an object made from the [[material]].
 +
 
 +
Density influences weight, which influences how easily dwarves can carry things. Density affects the momentum of weapon attacks, but only so much; 600 density has 80% the momentum of something of infinite density, and all normal metals have significantly greater densities than this, meaning that you can usually ignore it for deciding which weapons are stronger. Density also affects fall damage. DF simulates falling by shooting the ground at you, so denser floors do more damage.
 +
Density in ''Dwarf Fortress'' is in units of kg/m<sup>3</sup>*.
  
−
Density influences weight, and tests show that weight affects how much damage blunt-force [[weapon|weapons]] do. Additionally, lightweight edged weapons or attacking parts made of certain materials seem to have difficulty piercing tissue layers. Apparently, density in dwarf fortress is in kg/m<sup>3</sup>. Density also affects fall damage. DF simulates falling by shooting the ground at you, so denser floors do more damage.
+
: ''(* For example, in the real world, the density of pure gold is 19.32 grams/cm<sup>3</sup>, which works out to be 19,320 kg/m<sup>3</sup>, the same numeric value as the density of DF [[gold]] (see table below).)''
 
== Density of some materials ==
 
== Density of some materials ==
  
−
Note that not all forms of items are the same size, and so are not comparable when considering actual [[weight]] for practical applications, such as a [[Trap#Stone-fall_trap|door prize]]. A [[stone]] (including raw ore) has a size of 10,000 cm<sup>3</sup> and a [[log]] of wood 5,000 cm<sup>3</sup>, while a [[bar]] of metal ''(or a block of stone or wood)'' have a size of only 600 cm<sup>3</sup>, a difference of ~16.67:1 for vs. metals, or ~8.33:1 for wood vs. metals.  
+
Note that not all forms of items are the same size, and so are not comparable when considering actual [[weight]] for practical applications, such as a [[Trap#Stone-fall_trap|door prize]]. A [[stone]] (including raw ore) has a size of 100,000 cm<sup>3</sup> and a [[log]] of wood 50,000 cm<sup>3</sup>, while a [[bar]] of metal ''(or a block of stone or wood)'' have a size of only 6,000 cm<sup>3</sup>, a difference of ~16.67:1 for stone vs. metals, or ~8.33:1 for wood vs. metals.  
  
 
<!-- TABLE NEEDS A NEW COLUMN TO REFLECT THIS. CURRENT DATA IS MISLEADING w/ REGARD TO WEIGHT IN PRACTICAL APPLICATIONS.-->
 
<!-- TABLE NEEDS A NEW COLUMN TO REFLECT THIS. CURRENT DATA IS MISLEADING w/ REGARD TO WEIGHT IN PRACTICAL APPLICATIONS.-->
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! Notes
 
! Notes
 
|-
 
|-
−
|[[Feather tree]]||Wood||100||Least dense wood, found only in dry, good biomes
+
|[[Feather tree]]||Wood||100||Least dense wood, found only in good biomes
 +
|-  
 +
|[[Papaya]]||Wood||130||Second least dense wood, found only in tropical biomes
 
|-    
 
|-    
−
|[[Candlenut]]||Wood||140||Second least dense wood, found only in dry, tropical biomes
+
|[[Candlenut]]||Wood||140||Third least dense wood, found only in tropical biomes
 
|-
 
|-
−
|[[Adamantine]]||Metal||200||Least dense metal
+
|[[Adamantine]]||Metal||200||Least dense metal, light enough that it has much lower momentum in weapon attacks than others (about 57% for a normal dwarf)
 
|-
 
|-
 
|[[Raw adamantine]]||Stone||200||Least dense stone
 
|[[Raw adamantine]]||Stone||200||Least dense stone
 
|-    
 
|-    
−
|[[Kapok]]||Wood||260||Third dense wood, found only in dry, tropical biomes
+
|[[Kapok]]||Wood||260||Fourth least dense wood, found only in tropical biomes
 
|-    
 
|-    
−
|[[Willow]]||Wood||390||Fourth lightest, found in "wet" biomes, most widespread of "light" wood
+
|[[Willow]]||Wood||390||Fifth least dense wood, found near water, most widespread of "light" wood
 
|-
 
|-
−
||[[Bone]]||Organics||500
+
||[[Bone]]||Organics||500||
 
|-
 
|-
−
|[[Leather]]||Organics||500
+
|[[Leather]]||Organics||500||
 
|-
 
|-
−
|[[Silk]]||Organics||500
+
|[[Silk]]||Organics||500||
 
|-
 
|-
−
|[[Yarn]]||Organics||500
+
|[[Yarn]]||Organics||500||
 
|-
 
|-
 
|[[Tunnel tube]]||Wood||500||Least dense [[underground]] wood, found only in caverns
 
|[[Tunnel tube]]||Wood||500||Least dense [[underground]] wood, found only in caverns
 
|-
 
|-
−
|"typical" [[wood]]||Wood||600|| ''There are about 4 dozen varieties of wood at 600, about a dozen (unlisted here) that weight less,<br>and a half-dozen (sim) that weigh more.  See [[Wood]] for a full list and discussion.''
+
|"typical" [[wood]]||Wood||600|| ''There are nearly about twenty varieties of wood at 600+/-20, about twenty (unlisted here) that weigh less,<br>and about twenty (unlisted here) that weigh more.  See [[Wood]] for a full list and discussion.''
 
|-
 
|-
−
|[[Oak]]||Wood||700||Densest "common" wood, temperate/dry
+
|[[Persimmon]]||Wood||835||Densest wood found in temperate biomes
 
|-
 
|-
−
|[[Mangrove]]||Wood||830||Densest "normal" wood, found only in wet swamp biomes
+
|[[Olive]]||Wood||990||Densest "normal" wood, found only in tropical biomes
 
|-
 
|-
−
|[[Divine metal]]||Metal||1000||Second least dense metal
+
|[[Divine metal]]||Metal||1000||Second least dense metal, about 86.6% momentum on attacks
 
|-
 
|-
−
|[[Glumprong]]||Wood||1200||Densest above-ground wood ''(by far)'', found only in dry, evil biomes
+
|[[Glumprong]]||Wood||1200||Densest above-ground wood ''(by far)'', found only in evil biomes
 
|-
 
|-
 
|[[Blood thorn]]||Wood||1250||Densest wood, underground, found only in caverns
 
|[[Blood thorn]]||Wood||1250||Densest wood, underground, found only in caverns
 
|-
 
|-
−
|[[Lignite]]||Stone||1250
+
|[[Lignite]]||Stone||1250||
 
|-
 
|-
 
|[[Jet]]||Stone||1320||Least dense non-economic stone
 
|[[Jet]]||Stone||1320||Least dense non-economic stone
 
|-
 
|-
−
|[[Earthenware]]||Ceramic||1360
+
|[[Earthenware]]||Ceramic||1360||
 
|-
 
|-
−
|[[Plant fiber|Plant cloth]]||Organics||1520
+
|[[Plant fiber|Plant cloth]]||Organics||1520||
 
|-
 
|-
−
|[[Stoneware]]||Ceramic||2000
+
|[[Stoneware]]||Ceramic||2000||
 
|-
 
|-
−
|[[Saltpeter]]||Stone||2105
+
|[[Saltpeter]]||Stone||2105||
 
|-
 
|-
−
|[[Gypsum]] relatives||Stone||2300
+
|[[Petrified wood]]||Stone||2200||Least dense "magma-safe" stone
 
|-
 
|-
−
|[[Gypsum]]||Stone||2320
+
|[[Gypsum]] relatives||Stone||2300||
 
|-
 
|-
−
|[[Porcelain]]||Ceramic||2403
+
|[[Gypsum]]||Stone||2320||
 
|-
 
|-
−
|[[Glass]]||Gem||2600
+
|[[Porcelain]]||Ceramic||2403||
 
|-
 
|-
−
|(General) [[stone]]||Stone||2670
+
|[[Glass]]||Gem||2600||
 
|-
 
|-
−
|Ordinary [[gem]]||Gem||2670
+
|(General) [[stone]]||Stone||2670||
 +
|-
 +
|Ordinary [[gem]]||Gem||2670||
 
|-
 
|-
 
|[[Aluminum]]||Metal||2700||Least dense "normal" metal
 
|[[Aluminum]]||Metal||2700||Least dense "normal" metal
 
|-
 
|-
−
|[[Limestone]]||Stone||2710
+
|[[Limestone]]||Stone||2710||
 
|-
 
|-
−
|[[Marble]]||Stone||2780
+
|[[Marble]]||Stone||2780||
 
|-
 
|-
−
|[[Dolomite]]||Stone||2850||Least dense "magma-safe" stone
+
|[[Calcite]]||Stone||2930||
 
|-
 
|-
−
|[[Calcite]]||Stone||2930
+
|[[Gem|Diamond]] (any)||Gem||3520||
 
|-
 
|-
−
|[[Gem|Diamond]] (any)||Gem||3520
+
|[[Cobaltite]]||Stone||6295||
 
|-
 
|-
−
|[[Cobaltite]]||Stone||6295
+
|[[Zinc]]||Metal||7135||
 
|-
 
|-
−
|[[Lay pewter]]||Metal||7280
+
|[[Tin]]||Metal||7280||
 
|-
 
|-
−
|[[Galena]]||Metal||7500|| Ore of [[lead]]
+
|[[Lay pewter]]||Metal||7280||
 +
|-
 +
|[[Galena]]||Stone||7500|| Ore of [[lead]]
 
|-
 
|-
 
|[[Pitchblende]]||Stone||7600||Most dense "magma-safe" stone
 
|[[Pitchblende]]||Stone||7600||Most dense "magma-safe" stone
 
|-
 
|-
−
|[[Iron]]||Metal||7850
+
|[[Iron]]||Metal||7850||98.125% max momentum
 
|-
 
|-
−
|[[Steel]]||Metal||7850
+
|[[Steel]]||Metal||7850||98.125% max momentum
 
|-
 
|-
 
|[[Cinnabar]]||Stone||8100||Densest non-economic stone
 
|[[Cinnabar]]||Stone||8100||Densest non-economic stone
 
|-
 
|-
−
|[[Bronze]]||Metal||8250
+
|[[Bronze]]||Metal||8250||98.2% max momentum
 
|-
 
|-
−
|[[Copper]]||Metal||8930
+
|[[Nickel]]||Metal||8800||
 
|-
 
|-
−
|[[Silver]]||Metal||10490
+
|[[Copper]]||Metal||8930||98.35% max momentum
 +
|-
 +
|[[Silver]]||Metal||10490||98.59% max momentum
 
|-
 
|-
 
|[[Lead]]||Metal||11340||  
 
|[[Lead]]||Metal||11340||  
 
|-
 
|-
−
|[[Gold]]||Metal||19320
+
|[[Gold]]||Metal||19320||
 
|-
 
|-
−
|[[Platinum]]||Metal||21400||Densest metal
+
|[[Platinum]]||Metal||21400||Densest metal, 99.3% max momentum
 
|-
 
|-
 
|[[Native platinum]]||Stone||21400||Densest [[economic]] stone (and [[ore]])
 
|[[Native platinum]]||Stone||21400||Densest [[economic]] stone (and [[ore]])
 
|-
 
|-
−
|[[Slade]]||Stone||200000
+
|[[Slade]]||Stone||200,000||Densest stone, difficult to mine, brutally slow to carry if you do
−
||Densest stone, difficult to mine
 
 
|-
 
|-
 +
|}
 +
 +
==See also==
 +
* [[Size]]
 +
* [[Weight]]
  
 
{{Category|Physics}}
 
{{Category|Physics}}

Latest revision as of 03:27, 3 December 2023

xTATTEREDx  · +FINE+  · *SUPERIOR*  · ≡EXCEPTIONAL≡  · ☼MASTERWORK☼
v50.12 · v0.47.05
This article is about the current version of DF.
Note that some content may still need to be updated.

Material properties
Defined: Value • Color • Density • Strain at yield • Temperature values
Derived: Magma safety • Fire safety
Fluids: Depth • Flow • Pressure

Density is a material property that, along with volume, affects the weight/mass of an object made from the material.

Density influences weight, which influences how easily dwarves can carry things. Density affects the momentum of weapon attacks, but only so much; 600 density has 80% the momentum of something of infinite density, and all normal metals have significantly greater densities than this, meaning that you can usually ignore it for deciding which weapons are stronger. Density also affects fall damage. DF simulates falling by shooting the ground at you, so denser floors do more damage. Density in Dwarf Fortress is in units of kg/m3*.

(* For example, in the real world, the density of pure gold is 19.32 grams/cm3, which works out to be 19,320 kg/m3, the same numeric value as the density of DF gold (see table below).)

Density of some materials[edit]

Note that not all forms of items are the same size, and so are not comparable when considering actual weight for practical applications, such as a door prize. A stone (including raw ore) has a size of 100,000 cm3 and a log of wood 50,000 cm3, while a bar of metal (or a block of stone or wood) have a size of only 6,000 cm3, a difference of ~16.67:1 for stone vs. metals, or ~8.33:1 for wood vs. metals.


Name Type Density Notes
Feather tree Wood 100 Least dense wood, found only in good biomes
Papaya Wood 130 Second least dense wood, found only in tropical biomes
Candlenut Wood 140 Third least dense wood, found only in tropical biomes
Adamantine Metal 200 Least dense metal, light enough that it has much lower momentum in weapon attacks than others (about 57% for a normal dwarf)
Raw adamantine Stone 200 Least dense stone
Kapok Wood 260 Fourth least dense wood, found only in tropical biomes
Willow Wood 390 Fifth least dense wood, found near water, most widespread of "light" wood
Bone Organics 500
Leather Organics 500
Silk Organics 500
Yarn Organics 500
Tunnel tube Wood 500 Least dense underground wood, found only in caverns
"typical" wood Wood 600 There are nearly about twenty varieties of wood at 600+/-20, about twenty (unlisted here) that weigh less,
and about twenty (unlisted here) that weigh more. See Wood for a full list and discussion.
Persimmon Wood 835 Densest wood found in temperate biomes
Olive Wood 990 Densest "normal" wood, found only in tropical biomes
Divine metal Metal 1000 Second least dense metal, about 86.6% momentum on attacks
Glumprong Wood 1200 Densest above-ground wood (by far), found only in evil biomes
Blood thorn Wood 1250 Densest wood, underground, found only in caverns
Lignite Stone 1250
Jet Stone 1320 Least dense non-economic stone
Earthenware Ceramic 1360
Plant cloth Organics 1520
Stoneware Ceramic 2000
Saltpeter Stone 2105
Petrified wood Stone 2200 Least dense "magma-safe" stone
Gypsum relatives Stone 2300
Gypsum Stone 2320
Porcelain Ceramic 2403
Glass Gem 2600
(General) stone Stone 2670
Ordinary gem Gem 2670
Aluminum Metal 2700 Least dense "normal" metal
Limestone Stone 2710
Marble Stone 2780
Calcite Stone 2930
Diamond (any) Gem 3520
Cobaltite Stone 6295
Zinc Metal 7135
Tin Metal 7280
Lay pewter Metal 7280
Galena Stone 7500 Ore of lead
Pitchblende Stone 7600 Most dense "magma-safe" stone
Iron Metal 7850 98.125% max momentum
Steel Metal 7850 98.125% max momentum
Cinnabar Stone 8100 Densest non-economic stone
Bronze Metal 8250 98.2% max momentum
Nickel Metal 8800
Copper Metal 8930 98.35% max momentum
Silver Metal 10490 98.59% max momentum
Lead Metal 11340
Gold Metal 19320
Platinum Metal 21400 Densest metal, 99.3% max momentum
Native platinum Stone 21400 Densest economic stone (and ore)
Slade Stone 200,000 Densest stone, difficult to mine, brutally slow to carry if you do

See also[edit]

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