If you checked the Training Standards section first, you're on the right path but not quite there.

If something is relevant to a specific program; such as additional equipment for the Advanced Open Course or for individual Adventure Dives such as Night Diver or DPV, the individual course standards will be where you find that information. 

A huge amount of the planet is covered in water - awesome news for divers!

Much of it is found in the oceans and only approximately 2.5% of all water is fresh water and only about 1% of that is accessible as much of the Earths fresh water is ice caps and snowfields.

Each tissue compartment has 6 halftimes before it is considered saturated.

If the tissue compartment has a 60-minute halftime it will take 6 x 60 to be considered saturated. 

Refer back to your PADI Divemaster manual for a great section and graphics in Chapter 9 to help you revise before you join the PADI Instructor Course.

If any cylinder has been dropped, is visually damaged, has been exposed to temperatures above 82 degrees Celcius or hasn't been tested within local time requirements it must be hydrostatically tested before being filled and used.

Cylinders may be exposed to this heat during the repainting process and may affect the structural integrity of the metal. Therefore it stands to reason that the cylinder must pass a hydrostatic inspection prior to use,

Sometimes referred to as the auditory ossicles, they are three of the smallest bones in the human body and transmit sound from the surrounding air to the fluid-filled labyrinth of the cochlea. 

Want to learn more about the physiology of diving? Message me Ignite Your Life today!