If you added air to the space to maintain its volume, the air you added expands when you reduce the pressure as well. If the air is in an open container, the expanding air simply bubbles out into the surrounding water. In a closed, flexible container like a plastic bag or a balloon inflated at depth, the air volume grows proportionately with the decreasing pressure.

If you inflated the bag at 30 m/99 ft,it will be four times as big atthe surface - provided it can stretch that much? Otherwise, the bag will burst during I Depth Pressure ascent; this has importantimplications regarding your body air spaces that we'll look at shortly.

Based on what you've just learned, we can look at how the relationships between pressure, volume and density affect your body air spaces while Bali scuba diving. The air spaces that concern you as a scuba diver are the natural ones in your bod'y' and those artificially created by wearing Bali scuba dive equipment. 'Phe two major air spaces within your body,most noticeably affected by increasing pressure are your ears and sinuses. The major artificial air space most affected by increasing pressure is the one created by your mas