This is my favorite topic to go over in physics class because of the interesting fact that you breathe more air when you go deeper into water. I will explain what happens to your body in terms of pressure and how the air you breath in through your regulator (breathing device) is changed as well. They are really interesting facts and good to know in case of emergencies!

Pressure When Diving

First of all, if you remember from high school physics, as pressure increases, volume decreases. There are a few forms of measurement of pressure. I will use ATM, or atmospheres, because it is the most simple. At sea level, you are under 1 ATM of pressure. So, here is the cool part! Every 33.8 ft. or 10.3 meters you descend in water you gain 1 ATM, so 10 m of water gives us the same amount of pressure ALL the air above our head gives us because it is far denser. Here is a diagram:

Now, we can talk a little bit more about how much air you breath when you dive. Under each ATM you breath DOUBLE what you did under the last because volume is cut in half, so a bubble at the bottom of the ocean might cause a title wave at the top depending on how big it was. This can sink ships and has been theorized to be a cause of the Bermuda Triangle disappearances. Observe our picture again!

You can see how this can be troubling. It could literally come out of nowhere. Here is our breathing table (the average human lung capacity is 6 liters of air with a full breathe):

Pressure	Volume of Breathe	Depth in Water
1 ATM	6 Liters	0 m
2 ATM	12 Liters	10.3 m
3 ATM	24 Liters	20.6 m
4 ATM	48 Liters	40.9 m
5 ATM	96 Liters	61.2 m
...	...	...

A you can see... It gets huge, fast! Conserve air!!!

Physiological Effects

This air is in your body! Therefore, if you ascend too quickly the following could happen:

• Your lungs could explode if you do not breathe out!
• When you breathe there are molecules in the air other then oxygen. Nitrogen can become a problem (it has for me before when I had a diving accident) because it is absorbed into your blood. This will also expand when you rise and could cause an embolism which can result in killer headaches, or death, depending on how bad it is. This is called The Bends.
• Your sinuses decompress themselves, but your ears only do it on the way down. You have to Equalize manually every ten feet you descend in water or you will pop your ear drums. You do this by pinching your nose and blowing out. Try it now!
• A diver can descend as quickly as he/she wants because it is all manual on the way down, but on the way up you go very slowly and breathe out all of the time!

My Bad Experience

When doing a training dive I was required to take my mask off, put it back on, and clear the water out of it by blowing out of my nose. It looks like this:

Well... Haha. I did not do this right. When I went to put my mask back on I forced some water up my nose causing me to cough. I freaked out. Tossed my mask and headed to the surface from under 35 feet of water. I did breath out, but still went up way to fast! The instructor followed me up and we went back down, so I could "decompress" (let the nitrogen bubbles in my body release themselves slowly). This was the absolute worst headache I've ever experienced in my life. The only treatment I received was that the instructor pressed both pressure points on my hands (I guess this causes less bloodflow, less nitrogen in the brain). PAINFUL! Don't do this please!

I hope you enjoyed the lesson Steemians! Please check out my page if you're bored, there's a lot of interesting travel/fun/investment/tutorial blogs. Happy trails! Learn much and show your children!

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