化學博士K Kwong不時在社交平台分享化學知識，近日就談到古人會祭天求雨，原來不是只有迷信，背後有科學解釋。當中關鍵一步就是焚化，即睇點解焚化會導致降雨喇！
古代祭天祈求降雨有得解？
化學博士K Kwong以「古時旱災，好多人會犧牲同男童女，焚身祭天，祈求上天降雨。係咪好愚昧呢？」為引言，帶入為什麼焚化會導致降雨。他解釋若雨雲要形成降雨，首先天上充滿水分飽和的空氣要接觸到「核心 nuclei」，如果空氣沒有塵粒，沒有微細粒子作為核心讓水蒸氣可以集合成液體，則較難形成雨水。
古時祭祀求降雨背後的科學解釋，就是「焚化時製造微碳粒，燃燒嘅時候會製造熱氣，由於熱脹冷縮嘅關係，熱空氣會有較低嘅密度而向上升，造成熱氣流。微碳粒隨住熱氣流上升，遇到上層冷嘅潮濕空氣，就會形成微水滴。隨著微水滴越嚟越大粒，上升嘅空氣不足以將水滴帶返上天，就造成降雨。」
要達到效果的重點是製造微碳粒，而非獻祭童男童女，所以後來的人就改燒禾稈草燒。K Kwong又補充，「之後科學家更發現用飛機或者大砲，將鹵化銀粉末 （例如碘化銀），灑上天空，就可以造成人造雨。聽講拿破崙曾向天開砲，人工造雨，讓雨水形成沼澤阻住敵人前進。」
網民：係沙漠咁做有冇用？
有網民好奇，如果在沙漠燒草又能否影響降雨呢？K Kwong指要有另一因素配合，「要上層空氣濕度夠。」
▼原帖文▼
來源：K Kwong
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