how can you not reblog this tho
Shot in the water.
Okay, Science! time, now that I actually have a minute.
The things I do for you guys when I’m on my lunch break at work.
SO! There’s a lot of cool things happening here. First, let’s talk about that bubble in front of the pistol. We all more or less understand how a gun works; you pull the trigger, the hammer gets pulled back, then snaps forward and hits the pin on your cartridge, the pin ignites the powder, and the expanding gases from the combustion pushes the bullet out really really really fast. Some of that force from the gas is also used to slam the slide backwards, as well as eject the spent casing.
Ok, cool. So what’s up with that huge bubble? Well, since the gun is being fired underwater, the entire barrel of the gun is also filled with water. That bubble is mostly steam. The hot gases from firing the bullet instantly vaporizes the water in the barrel, which gets pushed out as a mixture with the gases. Once it exits the barrel however, it is quickly cooled off by the surrounding water, causing the bubble to contract and collapse; the remaining smoke is the leftover combustion products, basically ash. Basically what you’re seeing is the muzzle flash, in physical form. When fired in air, you can sort of see the gas leaving the barrel, but firing underwater lets you really see what happens.
Now to an even cooler thing. See the bullet over on the left of the image? See how it’s only travelled about 2 feet? That’s because of 2 things. 1) Water exerts much more frictional force on the bullet than air, for hopefully obvious reasons. 2) Even more importantly, water is incompressible. When you fire a bullet in air, it will actually compress the air in front of it before shoving it aside. This means that the bullet feels a lot less resistance; think of the difference between pushing your fist into jello vs pushing into sand. It’s a lot harder to dig into the sand, because it doesn’t squish. It doesn’t really want to move out of the way unless you try really hard. That’s similar to the difference between shooting in air and underwater. The water doesn’t really want to move out of the way, so the bullet has to push a lot harder, which slows it down much faster.
Now, this is a basic handgun. Maybe a 9mm or .40 caliber pistol. Nothing too powerful, as far as firearms go. So, as you can see, the bullet doesn’t go very far. Now, you might be thinking, what if I’m being shot at by a rifle? Them I’m screwed right? Even if I’m underwater, the bullet will go a lot farther, right?
Nope! A handgun will shoot the farthest while underwater out of any firearm. Here’s why. A rifle is actuallytoo powerful. When a rifle bullet is fired underwater, the higher powered gun puts a lot more kick behind the bullet, giving it a faster initial velocity. Now think back to how the water doesn’t want to move out of the way. That extra power will shatter the bullet before it gets anywhere at all. You end up firing out a bunch of shrapnel that goes nowhere. All those movies where you see the bad guys shooting assault rifles into the water, and those little bullet trails zipping down into the water? Absolute BS. Those bullets will hit the water and explode into a million bits before they’ve gone 2 feet into the water. A handgun bullet, on the other hand, fired into water will remain deadly up to about 9 or 10 feet.
So there you have it. If you’re ever being shot at, and you’re a good swimmer, dive underwater. You’re almost guaranteed to survive any shots fired into the water.
- Posted:5 hours ago