I include a CESA workshop in both Confined Water and Open Water in every PADI Instructor Development Course so candidates feel confident in their ability to teach and evaluate the skill from the very first course they teach.
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Most people go for Red Blood Cells and to be fair, they're on the right track. Red Blood Cells are one of the components of blood but the protein haemoglobin within the cell transports Oxygen and Carbon Dioxide around the body.
Check out the back of your RDP or the inside lid of your eRDPml for the flying after diving guidelines.
Everybody loves a bit of mathematics without a doubt. For this one, we just divide the maximum ppO2 by the percentage of O2 in the breathing mix and this will give up the maximum atmospheric pressure it can used at.
1.4 / 0.32 = 4.375. Turn it into metres of fresh water by subtracting 1 for the air pressure and then dividing it by 0.097 ATM p/metre and we get....