Each tissue compartment contains 6 halftimes. Every compartment is named for the time it takes for each halftime to fill 50% of the available space while loading.

This means 1 halftime to become 50% saturated, 2 half times to become 75%, 3 to become 87.5 and so on.

The passive movement of gasses from areas of high concentration to areas of lower concentration is important for us to understand in regards to inert gas loading and first aid for decompression incidents.

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Occasionally in GSP exams, you may be asked a question from PADI's Guide To Teaching as this is an extension of your PADI Instructor Manual. Think of it as the 'how' to the PADI Instructor Manuals 'what'. 

Grab your PADI Guide To Teaching and look for the section - Professional Association of Diving Instructors and you'll see their Core Competencies along with their Mission Statement as well as a history of PADI itself. 

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The easiest way to get the correct answer for questions like this is to take the object to the surface first. This gives you a constant to work with for the second part of the equation. 

Let's work through it. 

20% capacity at 25m/sw means it's under 3.5ATA of pressure. If taken to 1ATA it's capacity will increase to 70% (20x3.5=70) 

We can then take the lifting device back down to 10m/sw which means it will be under 2ATA of pressure leaving it's capacity at 35%. (70/2=35)

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Know your way around a vessel? 

The Stern is at the rear so if you're facing portside will be to your right, starboard to your left and the bow behind you.