UC知道初中英语科普文章翻译~
来源：百度知道 编辑：UC知道 时间：2024/05/18 04:00:57
A century and a half of scientific inquiry has yet to solve this one. It's clear that a thin layer of liquid water on top of solid ice causes the slipperiness. A fluid's mobility makes it difficult to walk on, even if the layer is thin. But there's no consenus as to why ice -unlike most other solids-has such a layer.
Scientists long reasoned that, since water has the unusual property of being less dense as a solid than as a liquid, its melting point can be lowered with an increase in pressure. While this is true, even the sharpest of skates raises the melting point by only a few degrees. The pressure theory doesn't hold water unless the ice is pretty warm already. Something else must be going on.
Some studies suggest that friction from a moving shoe, skate or tire causes the heat necessary to melt the ice beneath it. But what if the shoe isn't moving at all? A second theory proposes that ice inherently has a fluid layer, caused by the motion of surface mol
Scientists long reasoned that, since water has the unusual property of being less dense as a solid than as a liquid, its melting point can be lowered with an increase in pressure. While this is true, even the sharpest of skates raises the melting point by only a few degrees. The pressure theory doesn't hold water unless the ice is pretty warm already. Something else must be going on.
Some studies suggest that friction from a moving shoe, skate or tire causes the heat necessary to melt the ice beneath it. But what if the shoe isn't moving at all? A second theory proposes that ice inherently has a fluid layer, caused by the motion of surface mol
一个半世纪的科学探究至今仍未解决这个1 。它明确指出，薄层液体水对上方的坚冰，导致slipperiness 。流体的流动性使人们难以对步行，即使层是薄的。但没有consenus至于为何冰不同于大多数其他固体-有这样的层。
科学家长期的理由是，由于水具有不寻常的财产被密度较低，作为一个坚实的比作为液体，其熔点可以降低与增加的压力。虽然这是事实，甚至尖锐的冰鞋，提高熔点只有几摄氏度。压力理论是根本站不住脚的，除非冰是相当热烈，已经。其他必须进行。
一些研究表明，摩擦从运动鞋，滑板或轮胎的原因热要融化的冰下方。但如果鞋是不是移动在所有？第二个理论的提出，冰在本质上有一个流体层，所造成的议案，表面分子有没有上述绑定到，所以走动，在搜索的稳定。该防滑culpri可能是一个组合，这两个理论