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위키매체공용 자유롭게 사용할수 있는 117,762,123개의 매체 서류가 있으며, 누구나 기여할수 있습니다. |
오늘의 그림
Interrupted Reading by French artist Jean-Baptiste-Camille Corot. Today is World Book Day.
오늘의 매체
![]() Preparation of amorphous silicon (1) and magnesium silicide (2), upon reduction of powdered sand with magnesium powder:
(1) SiO2(s) + 2Mg(s) = Si(s) + 2MgO(s); and (2) 2Mg(s) + Si(s) = Mg2Si(s).The reaction described by (1) is initiated by heating; then it is self-sustained and is highly exoenergetic. 참여하기
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![]() A RhB Ge 4/4 II with a push–pull train crosses the Wiesen Viaduct between Wiesen and Filisur, Switzerland.
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