學者指點蠟燭時撒麵粉 粉狀微細物變得容易搶火
即时港闻
发布： 2018-11-21 19:01
撰文： 無綫新聞
有學者指，當點燃蠟燭時撒麵粉，粉狀的微細物質會變得容易搶火。
中大生命科學學院副教授何永成說︰「當粉末變成納米般小的粉狀時，著火的燃點會變低。所以粉狀散播開來一有少許火焰，它就容易一口氣著火。如果開了窗，它的(粉塵)濃度會降低，隨著氣流粉狀會分散開。但如果在狹閉系統，粉狀很容易佈滿整間房或環境，一有火就會著火。而火勢就會形成爆炸情況，其實就是一個激烈的化學反應。」
中大生命科學學院副教授何永成說︰「當粉末變成納米般小的粉狀時，著火的燃點會變低。所以粉狀散播開來一有少許火焰，它就容易一口氣著火。如果開了窗，它的(粉塵)濃度會降低，隨著氣流粉狀會分散開。但如果在狹閉系統，粉狀很容易佈滿整間房或環境，一有火就會著火。而火勢就會形成爆炸情況，其實就是一個激烈的化學反應。」
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