時間箭嘴(英文:arrow of time / time's arrow)係物理學上有關時間嘅一個重要概念。有好多廿世紀嘅物理學家都對時間呢樣嘢嘅本質覺得好奇。而時間箭嘴呢個概念指出嘅係,時間呢樣嘢有兩種特性:
於是啲物理學家就將時間比喻成一個箭嘴噉,永遠淨係會指去一個方向。
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