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Difference between revisions of "Density"
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'''Density''' is a [[material]] property that, along with volume, affects the [[weight]]/mass 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 | + | 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>*. | ||
: ''(* 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).)'' | : ''(* 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).)'' | ||
Revision as of 05:44, 28 June 2023
v50.14 · 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
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 10,000 cm3 and a log of wood 5,000 cm3, while a bar of metal (or a block of stone or wood) have a size of only 600 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 |