熱寂jit6 zik6(英文:heat death),或者叫熱死亡,係根據熱力學第二定律(The second law of thermodynamics)作出、有關宇宙最終命運嘅猜想。
根據熱力學第二定律,一個封閉系統(closed system)當中嘅熵(entropy)永遠唔會跌,只有可能維持不變或者升。呢條定律意味咗,搵個封閉系統,隨住時間過去,佢內部嘅粒子同能量頂櫳維持唔郁,而喺現實多數會慢慢走位,會漸漸趨向熱力學平衡(thermodynamic equilibrium)-熵數值最大化嘅狀態。因為噉,宇宙嘅總熵會係噉升,而如果宇宙最後真係完全變成熱力學平衡,根據物理學家計算,宇宙最後會變成溫度分佈完全平均,而且溫度接近絕對零度(攝氏零下 273.15 度)嘅空間,唔會再有任何作功,更加唔會有生命-而呢個情況就係假想中嘅熱寂。
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