推荐回答（1个）
看到这个问题，在我脑海中立马闪现出的就是《拯救大兵瑞恩》中电影开场，诺曼底登陆时德国军队扫射海面的场景！电影中的画面是，子弹从海面直冲水底，在海水中拖着尾迹射向水中的盟军将士，击中人体后立即血迹四散，场面惨烈悲壮！
以我理科生的直觉，炽热的子弹高速运行，在液态冰冷的海水中将迅速降温，并且承受很大的海水阻力，速度越快阻力越大！这样的话，在海水中低温低速的子弹真的能伤害到盟军士兵吗？恰好有一次在电视中看到这个话题，并且实验人员是用不同类型的枪械做的实验，下面来给大家分享一下。
首先，明确一点就是子弹在水中的杀伤力是大大减弱的。子弹的飞行距离与其飞行介质的密度密切相关，密度越大，子弹所受的阻力越大，那么最终子弹的飞行距离和杀伤力都将大大折扣。水的密度是1000kg每立方米，而空气的密度是1.29kg每立方米，那么水的密度是空气的密度的1000/1.29=775倍。那么也就是说子弹在水中受到的阻力是约是空气的775倍。其次，子弹在进入水中之后，由于受到巨大的阻力，导致其弹道不稳定，直接的后果就是子弹翻滚，那么翻滚中的子弹其阻力又会更大。这样子弹在水中的有效射程和杀伤力将会更弱！
同样型号，相同初速度的子弹击中人体的不同部位，造成的伤害也是不一样的。本文以未击中头部与心脏等重要部位为例分析。其次，水中子弹翻滚也不深入考虑，以子弹的弹头击中为主。其他的后果与场景读者自行脑补吧。
以我军长期使用的96式步枪为例，口径和使用子弹为7.62MM，有效射程800米，该枪械最大杀伤距离在400米左右，初速度为780米/秒，在空气中肌肉部分可贯穿，如有骨骼阻挡可嵌入5CM - 7CM。那么该弹在水中的最大射程是800米/775=1.03米，再加上子弹的弹道翻滚，最大射程将低于1米。如果在1米以下的水下，已经超出了子弹的射程，不会造成任何伤害；如果是在0.5米水下，约为空气中的一半，肌肉部分子弹会留在体内，造成撕裂伤，需要尽快手术，如有骨骼阻挡则约为2.5CM – 3.5CM。
综上所述，子弹在水中对人体的伤害将会大大减弱。但是具体的伤害程度，与子弹型号，初速度，击中人体部位等很多因素相关。读者可以按照上面水中阻力为空气775倍，结合空气中杀伤程度，自行分析。
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