Solidot: 蜘蛛利用电场产生升力

Solidot

奇客的资讯，重要的东西

蜘蛛利用电场产生升力
http://solidot.org.feedsportal.com/c/33236/f/556826/s/31a2362f/sc/38/l/0L0Ssolidot0Borg0Cstory0Dsid0F36576/story01.htm
Sep 24th 2013, 13:04

小蜘蛛会利用蜘蛛丝作为飞翔的工具，它们将蜘蛛丝喷向空中，像乘气球一样升到空中迁徙到不同的地方。生物学家曾在海拔4公里的高空发现过它们。传统观点认为， 蜘蛛丝利用了热气流，但这无法解释在无风或微风的情况下蜘蛛是如何实现飞升的。根据发表在预印本网站的一篇论文，夏威夷大学物理学家Peter Gorham发展了近两百年前的一个观点：蜘蛛利用静电力升到空中。地球表面存在天然的电场，平均每米电压120伏特，方向向下。Gorham计算发现，一串蜘蛛丝只需要携带30左右nanoCoulombs的负电荷就能提升起一只蜘蛛。
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