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世界上密度最低的固体


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世界上密度最低的固体称之为"气凝胶",这种材料看似脆弱不堪,其实非常坚固耐用,最高能承受1400摄氏度的高温,而且其99.8%以上是空气。目前最轻的硅气凝胶仅有3毫克每立方厘米,仅比空气重三倍。已入选吉尼斯世界纪录。俄罗斯“和平”号空间站和美国“火星探路者”探测器上,都用到了气凝胶材料。当然你也可以理解为它是世界上最轻的固体。

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