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Why heat wave warnings are falling short in the U.S.

Why heat wave warnings are falling short in the U.S.
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为何湿气会让人不适?水蒸汽会让皮肤"窒息"吗?|美国_新浪科技_新浪网


  答案是,高湿度天气会让我们感觉比干燥的天气更热,依据美国国家海洋和大气管理局(NOAA)的观点,这是由于空气湿度(即空气中水蒸汽的含量)会让人们很难通过汗液排出多余体热。
  通常情况下,当汗珠在人体皮肤表面时,身体热量将汗珠蒸发到空气中,从而使我们的皮肤感到凉爽。然而,空气湿度会阻止汗水轻易蒸发,因为周围的空气中已有较高含量的水分,无法吸收人体的水分,伴随着汗水从皮肤表面蒸发的减少,人体就会感到越来越不舒服的闷热烦躁。
  高温增强了湿度阻碍湿度调节的能力,因为热空气比冷空气能容纳更多的水分,依据NOAA国家环境信息中心的统计数据,气温上升0.55摄氏度,相当于大气水蒸汽增加4%,这就解释了为什么湿度在夏季比在冬季更令人感到不适,即使湿度水平相近的情况下。
  湿 ....

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