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Earth and Space Sciences · 术语表

什么是 Condensation temperature, condensation sequence?

又称: condensation temperature · condensation sequence

Definition 2.3 University Earth and Space Sciences — Year 2 · 第 2 章 — Planet Formation and Meteorites

The condensation temperature of an element in a cooling gas of given composition and pressure is the temperature at which half of it has passed into solids at chemical equilibrium (the 50 per cent condensation temperature; the temperature at which its first solid appears is the appearance temperature). The condensation sequence is the order in which the elements and their solid compounds appear as the gas cools.

solidformulaappears at (K)
corundumAlX2OX3\ce{Al2O3}1677
hiboniteCaAlX12OX19\ce{CaAl12O19}1659
perovskiteCaTiOX3\ce{CaTiO3}1593
spinelMgAlX2OX4\ce{MgAl2O4}1397
iron–nickel metalFe\ce{Fe}, with Ni\ce{Ni}, Co\ce{Co}, Cr\ce{Cr}1357
forsteriteMgX2SiOX4\ce{Mg2SiO4}1354
schreibersiteFeX3P\ce{Fe3P}1248
troiliteFeS\ce{FeS}704
magnetiteFeX3OX4\ce{Fe3O4}371
water iceHX2O\ce{H2O}182
ammonia hydrateNHX3 ⋅ HX2O\ce{NH3.H2O}131
methane clathrateCHX4 ⋅ 7 HX2O\ce{CH4.7H2O}78
Table 2.1. The condensation sequence of a gas of solar-system composition at 10−410^{-4} bar: the temperature at which each solid first appears. Sodium and potassium enter feldspar; nickel, cobalt and chromium dissolve in the metal. Data: Lodders (2003).
The 50 per cent condensation temperatures of 36 elements in a gas of solar-system composition at 10-4 bar, coloured by Lodders’ volatility groups (oxygen: as water ice; carbon: as methane clathrate and ice). Data: Lodders (2003).
The 50 per cent condensation temperatures of 36 elements in a gas of solar-system composition at 10−410^{-4} bar, coloured by Lodders’ volatility groups (oxygen: as water ice; carbon: as methane clathrate and ice). Data: Lodders (2003).
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