这一过程使挥发物从煤中蒸馏出来而产生多孔的焦炭。
This causes the volatiles to be distilled from the coal to give a porous coke.
当恒星逐渐缺少能源，它的核心部分变得越来越小，温度逐渐升高，同时使外层物质挥发。
As the star begins to run out of fuel, its core becomes smaller and hotter, boiling off its outer layers.
较低的温度可减少成分的表面蒸发，使那种将成分吸到表面并挥发掉的毛细管现象降到最小。
Lower temperatures will reduce surface evaporation of constituents minimizing the capillary action that draws constituents to the surface where they would be volatilized.
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