YouTube scientistMark Roberand molten metal obsessiveBackyardScientistteamed up to answer a simple interrogative sentence : is a grenade deadlier on demesne or under water ? But in rescript to answer that , we need to sympathise just what a grenade does .
The metal casing of a grenade is designed to fracture at specific point so that , when detonated , it essentially becomes irregularly determine bullet train that fly in all directions . Getting hit by those is bad ! But there ’s also a pressure sensation wave that s created from the explosion itself .
On juiceless Edwin Herbert Land , lay down — feet towards the blast — at least 15 feet aside minimizes your chances of getting hit by shrapnel . But underwater the drag force is much , much higher than air , so shrapnel , high - powered bullets , and risky swimmer do n’t travel very far .
The detonation also causes a serious pressure wave , however . Air can be compact much more than water , which means that the detonation spread out easy on soil . subaquatic though , it travel direct through the urine and stumble you full personnel where it meets something that it can compress — specifically , the aura in your lung and other variety meat . As you may think , that ’s really bad news for your lungs if you like them unruptured and lunging normally . At 15 feet you would be 100 percent dead .
Of course , the most advantageous version of this scenario is being underwater while the explosion happen on acres . It happens in just about every activity picture , which is how you know its true .
Mark RoberScience
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