The simplest type of snorkel is a plain tube that is allowed to flood when underwater. The snorkeler expels water from the snorkel either with a sharp exhalation on return to the surface (blast clearing) or by tilting the head back shortly before reaching the surface and exhaling until reaching or breaking the surface (displacement method) and facing forward or down again before inhaling the next breath. The displacement method expels water by filling the snorkel with air; it is a technique that takes practice but clears the snorkel with less effort, but only works when surfacing. Clearing splash water while at the surface requires blast clearing.[6]
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In Scuba diving, as one descends, in addition to the normal atmospheric pressure, water exerts increasing pressure on the chest and lungs—approximately so the pressure of the inhaled breath must almost exactly counter the surrounding or ambient pressure to inflate the lungs. By always providing the breathing gas at ambient pressure, modern equipment ensures the diver can inhale and exhale naturally and virtually effortlessly, regardless of depth.

Have you been dreaming of warm summer days lying under palm trees at the beach or floating in the ocean on your surfboard? We have, and to prepare ourselves for the long awaited arrival of our favorite summer season we’ve been working hard on the designs for this season’s bikinis for women. At ROXY, we’re experts when it comes to surf lifestyle and beachwear, and our bikinis provide the best possible designs for you to slip into this summer. Bikinis are a staple of any surfer girl or beach bum’s wardrobe, and we want to make sure you’re dressed in the best when it comes to your day of fun in the sun.
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