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arXiv 1902.05005astro-ph.EP
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元素挥发热力学及其在行星过程中的应用

Thermodynamics of Element Volatility and its Application to Planetary Processes

Paolo A. Sossi, Bruce Fegley

摘要:

尽管它在地质科学中很重要,但我们对气体和凝聚相(包括固体和液体)之间相互作用的理解仍然受到这样一个事实的影响,即通常只有间接证据可以证明它们的存在。这是由于蒸汽相的密度低得多,因此体积大,蒸汽相有从与其相互作用的冷凝相中逸出的趋势。对于足够稀薄的气体,其组成分子之间不会发生相互作用,这种关系在理想气体定律中被量化(Clapeyron 1834):其中$PV=nRT$是由气体施加的总压力,$V$是其体积,$n$是摩尔数,$R$是气体常数8.3145 $Jmol^{-1}K^{-1}$,Horstmann,1873)和$T$绝对温度。一摩尔理想气体在273.15 $K$和$10^5$ $Pa$(气体的标准温度和压力)下的摩尔体积为22,711 $cm^3/mol$,$10^3$ x大于典型的硅酸盐液体或矿物。因此,自然界中的蒸发过程通常由冷凝相中残留的化学和结构证据来提供信息。

英文摘要:

Despite its importance in geological sciences, our understanding of interactions between gas and condensed phases (comprising solids and liquids) remains clouded by the fact that, often, only indirect evidence remains for their occurrence. This arises from the tendency for the vapour phase to escape from the condensed phase with which it interacts, owing to its much lower density and thus greater volume. For a gas that is sufficiently tenuous that interactions do not occur between its constituent molecules, this relationship is quantified in the ideal gas law (Clapeyron 1834): $PV=nRT$ (1) where $P$ is the total pressure exerted by the gas, $V$ its volume, $n$ is the number of moles, $R$ the gas constant 8.3145 $Jmol^{-1}K^{-1}$, Horstmann, 1873) and $T$ the absolute temperature. One mole of an ideal gas at 273.15 $K$ and $10^5$ $Pa$ (standard temperature and pressure for gases) has a molar volume of 22,711 $cm^3/mol$, $10^3$ x greater than typical silicate liquids or minerals. As a result, vaporisation processes in nature are often informed by chemical and textural evidence remaining in the condensed phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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