春日頑石：為何停車場的骯髒雪堆，總是最後融化？
天氣回暖，為何停車場的殘雪堆總是最後一個融化？本文揭示其背後的兩大科學原理：「熔化潛熱」與「絕緣效應」，解釋這個常見卻有趣的城市現象。
時序入春，氣溫回升，但許多人總會發現一個奇特景象：停車場角落那些因除雪而堆積的骯髒雪堆，彷彿一座座頑固的紀念碑，紋風不動。明明陽光普照，為何它們的融化「時間」如此漫長？背後其實蘊含著簡單卻強大的物理學原理。
根據《波士頓網》的分析，箇中玄機有二。其一，是物理學上的「熔化潛熱」。物體從固態變為液態，需要吸收大量能量，光有溫度上升還不夠。一座巨大的雪堆，就像手中的冰塊不會瞬間化水一樣，需要龐大的能量才能徹底瓦解。
其二，則是雪堆的「厚度與密度」。這些雪堆是人為鏟雪堆積「製造」而成，過程中雪被層層壓實。如此一來，外層的雪反而形成了一層天然的隔熱罩，保護內部深處的雪不受外界暖空氣和陽光的影響。結構越是緊密，融化所需能量就越多。
那麼，該如何加速融化？答案是「降雨」。雨水能有效滲透雪堆，破壞其隔熱結構，從內部擊潰。這種頑固的雪堆可以持續很長時間，例如2015年波士頓經歷一場大雪後，其中一座巨型雪堆直到當年七月才完全消失。
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