Where can you get a squeeze? Ears, sinuses, mask, lungs, teeth How do you equalise air spaces in ears? Blow and squeeze nose, wiggle jaw, swallowing How often should you equalise? Every metre before discomfort What do you do if you feel discomfort? Ascend until discomfort eases, equalise, continue descent slowly Why can't you scuba while sick? Congestion can plug air passages so you can't equalize What is mask equalisation? exhale into mask by nose What does your nose need to be in the mask? To equalize First rule of diving Always breathe continuously What happens if you hold your breath during ascent? Lung over expansion, forces air into bloodstream and chest cavity, leading to paralysis or death. Pressure outside air space is more than pressure inside air space.

How do you maintain air volume as you descend? Equalize What is a 'squeeze'? As volume decreases, pressure pushes body tissues inwards toward air space, causing discomfort. 1 bar is what depth? 0m/0ft 2 bar is what depth? 33ft/10m 3 bar is what depth? 66ft/20m 4 bar is what depth? 99ft/30m How is air volume affected when depth is increased? It decreases How is air density affected when depth is increased? It increases What happens if you take an air volume underwater with you in a flexible container or inverted jar? As pressure increases the volume decreases, same air but smaller space. Where are some air spaces located in the body? Ears, sinuses, lungs Do you always feel the pressure in body air spaces? Only if the pressure is different inside and outside the air spaces.

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