Do you mean how they hold onto your face, or how they let you see underwater?
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The air that is in the goggles is a gas. As you go deeper you have the gas taking up less space which creates a vacuum, plus the added pressure from the water above you. The strap is just there to keep it from getting knocked off.
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So basically, you see best when there’s air in front of your eyes. Goggles do just that and trap air in front of your eyes and keeping the water out.
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Same as pool goggles, but bigger.
You know how suction cup work? same principle. it sucks to your eyes and prevents water from getting in.
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