Free diving (inform)

Have you ever heard about 'Free diving'?
Free diving is a sort of underwater diving without SCUBA which is mean self-contained underwater breathing apparatus. So free diving is no breathing apparatus. It relies on only diver's hold breath. So it's one kind of skin diving which is same with snorkeling. 
Then show you free diving's equipment.

First one is mask. Mask is protecting your eyes from the water. And it has little different with swimming goggles. Mask has nose skirt but swimming goggles doesn't have it. Skirt helps user to prevent compressed air under the water. So when compression happens, you can breath with nose, then air is applied. So compression is disappeared.

Second one is  fin.  Fin is for driving force under the water. So free diving in is longer than skin diving fin. Left one is free diving fin and right one is skin diving fin.

Third one is snorkel. Snorkel helps breath. When you breathe in the water, you have to raise you head to air. But you have snorkel, you can breathe near the surface of water.

Last one is suit. Under the water, you lose your body heat. Because water's specific heat is high. So you have to wear suit when you are diving.
















With this equipment you can see under the water. But you know diving physics.
It's very important for your health. In diving lot of physics, but I suggest one of them

It's about Boyle's law. When you're diving under 40m, you have 5 atmospheric pressure air. So You stop breathe in the water, after that you have to stop to spit breath. Because you spit breath, you can have shallow water blackout. Shallow water blackout is oxygen deficiency. So you just breath out, your oxygen is decreased. Then blackout is occurred. 

It's good picture for information about shallow water blackout.

So when you're free diving, you have to know about this information. Safe diving is good diving and fun diving.

 

It's free diver's video. It's very amazing and wonderful.