【科學冷知識】為什麼低於身體溫度的溫度下仍覺得很熱?

醫藥健康 自然與科學

人體正常體溫為36至37℃,身體不是應該在環境體溫高於體溫時才會覺得熱嗎?

這與身體的散熱機制有關,人體散熱主要靠流汗,流汗時將熱排走。

身體與環境溫差較大時,熱量很容易從身上流出,身體很快會降溫;當環境變暖並接近體溫時,散熱時間較長。

這種情況就如將冰水倒入熱水,以及將室溫水倒入熱水的分別,當然是冰水倒入熱水較能將水溫降低。

要快速降溫,就要讓環境與體溫等差較大,開冷氣﹑飲凍水和冷水浴也可以呀!



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