Plus, while you're faffing about with that, whoever threw the grenade at you is still putting fire down on your position. I've seen some ill-advised suggestions to cover it with your helmet. Below are the remains of Medal of Honor winner Jason Dunham's helmet. While securing an insurgent he noticed that the insurgent dropped a grenade at his feet.
He covered the grenade with his helmet and his own body. Dunham died of his wounds. As you can see, the Kevlar threads are clearly visible, and the helmet, though ripped apart, is still in large chunks.
Because the helmet covered the grenade, it collected the full force of ALL of the shrapnel even that which would have otherwise been directed away from him.
If the grenade had been on the ground next to him, this helmet would have been largely intact but he still would likely have been killed. What this illustrates is how important minimizing exposure, and maximizing cover are when dealing with a grenade. Every bit of your body out of the potential blast cone, every bit of shrapnel that goes in a different direction from you, each little bit of that maximizes your chances of survival. Back in , when I was in Iraq, we were executing a cordon and search operation in Baghdad.
There was one particular house that we had a pretty good idea had some insurgents in it. I was outside, just down the block, when a team from our Bravo company went in to clear the house. They took fire immediately on entering the door, and someone from upstairs threw a Russian RGD-style grenade down the stairs. Still not happy with a 1 percent chance of being punctured by a pellet of hot metal?
Me neither, so let's hop in the pool. Thanks to another YouTube scientist , Norwegian physicist Andreas Wahl, we know that getting shot underwater is nowhere near as dangerous as getting shot on land but probably just as terrifying , and the same physics that saved Wahl from a nasty injury could theoretically protect Kevin from his hypothetical grenade. As the video explains, the pressure from the water against the grenade projectiles would be so great, the projectiles would actually disintegrate before they make it anywhere near Kevin.
But this isn't the whole story, because while the grenade pellets can't touch Kevin, he'll still end up percent dead for choosing to spend some time in a pool with a grenade. I'll let the boys explain that with their experiments in the video above , but let's just say that 1 percent is suddenly looking like the only way to go Here's Andreas Wahl and his underwater gunshot experiment :.
Mark Rober. One hand grenade is in the pool , the other is by your chair. Which blast is more dangerous? If you chose to jump in the pool rather than endure the explosion on land, we have some bad news for you: You made a disastrous decision.
Assuming the blast from both hand grenades was identical in strength and that you were the same distance from either blast, the underwater explosion, also known as an UNDEX , would be far more dangerous. Of course, the hand grenade by the side of the pool is no bundle of joy either. All explosives are little more than elements that burn or decompose at an incredible speed. This chemical or, in some cases, nuclear reaction produces a massive amount of heat and gas in a very short period. Explosive chemical reactions break down compounds into highly compressed gases, as well as heat resulting from compound molecules being blasted apart.
The gases expand rapidly, and the heat speeds up individual gas particles to increase expansion speed even more. This rapidly expanding gas, called a pressure wave , is the key to any explosive's destructive power. If the pressure wave is fast enough to break the sound barrier, it generates a powerful shock wave.
A land explosion can burn skin, tear apart limbs and propel objects and shrapnel through the air. When the pressure wave travels through the air and connects with a living organism, the organism's body reflects most of the force.
This is because there's a difference in densities: The molecules in solid skin are closer together than the rapidly moving gas molecules. However, portions of your body contain gas, meaning the density is the same as the expanding gas in the pressure wave.
The pressure wave hits the body and, while most of it is reflected, some of it manages to compress internal gases. As a result, the victim sustains primary blast injuries.
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