The amount of air you consume in PSI/BAR will increase. The deeper you go, the more air you breathe with every breath.
If you ascend to a shallower depth, you will consume your air less quickly. The deeper you go, the faster you breathe your air. With your existing knowledge of diving you know:
I will also start by focusing on questions where pressure is the key component and then look at other topics. Later parts will use the same fundamentals to answer more complicated questions. In Part 1, I start with the basics and EASY questions.