Posts Tagged ‘diy’
Light Scuba
Why would inhaling pure oxygen cause someone to suffer from light headedness?
For example, when Scuba Divers dive, they use tanks that contain a gas mixture much like air. If they used tanks that contained pure oxygen, they could suffer light headedness. Explain why inhaling pure oxygen gas might cause light headedness (2 marks).
Actually...divers use an atmospheric mix for a simple reason...and it has nothing to do with lightheadedness...
Oxygen is LETHAL at high concentrations at different partial pressures. If a diver were to dive to much over 120 feet on a standard atmospheric mix, they would be risking Oxygen Toxicity. Deep dives have to use a special mix that includes helium to prevent the O2 we need from killing us.
Besides, if we breathed 100% oxygen on a dive, we'd loose the reflex to exhale. Carbon Dioxide in the air helps trigger the body's breathing reflex. In a 100% oxygen atmosphere, a human would have to conciously force him/herself to exhale and inhale until the CO2 levels in the blood started reaching near lethal levels.
By the way...if you're trying to sneak-in exam/study questions, it's usually a good idea to remove the scoring value! 
Good Luck!
SCUBA AND X DOUBLE TEAM LIGHT SHOW
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M6 Lithium Tactical Light, Black, Box (PL2320B-BLK) Category: M Flashlights $41.88 Item #: PL2320B-BLK. 5.50 in. black CNC-machined aluminum flashlight powered by two CR123 lithium cells. Features include, high-pressure Xenon lamp, 74 lumens, 7.8 watts, 20,000 candlepower and water resistant. Lamp life of 120. Battery burn time of 1.0. 1.30 amps. 6 volts. W. 5.50 in. black CNC-machined aluminum flashlight powered by two CR123 lithium cells. Features include, high-pressure Xenon ... |
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Scuba Diver Down Fun Party String Lights (SJ) $8.00 Great for the boat, on the patio, or on your Christmas tree! Each 12 foot string of party lights has 10 plastic covers as shown in the photo. String lights can be used indoors or outdoors, and have end-to-end connectors so up to two additional sets of string lights can be added. Plastic covers (2.5" x 1.25") snap easily onto each light.... |
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Diver Down Party String lights patio lighting c7 $10.00 Diver Down Lantern Indoor/Outdoor Party String lights. The 10 Diver Down lantern plastic covers, each measures about 4 7/8 inches tall x 2 1/2 inches wide (the size of a 12 oz. can of soda) like the ones in the picture. The 12 foot wire in this set of string lights is green and constructed like an extention cord so up to 3 sets of string lights can be connected together. Some assembly is required,... |
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Replacement Lamp, 13.2 watt for C8 $15.00 13.2 Watt replacement lamp for Sunlight C8.... |
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Decorated Mouse Pad with diver, light, diving, holding, scuba $9.95 Professional "Brite White" fabric mouse pads are among the most versatile and durable, providing brilliant graphic reproduction for spot color or full color imprints. This durable polyester surface is above industry standards and provides a superior product value overall. Designed to reproduce vibrant detailed images. Our mouse pads have white fabric top with the 100% genuine black rubber base (n... |
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MityLite NEMO 1900 2AAA LaserSpot Flashlight $14.95 Unlike conventional flashlights that have a yellowish beam, the MityLite 1900 uses a hi-intensity Xenon lamp that produces a powerful, bright beam. Use this compact flashlight to cut through thick smoke, fog, and dust. It is submersible to 500 feet and comes with a twist-on shroud. The 1900 is ideal for any situation. Powered by 2 AAA alkaline cells.... |
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Intova Wide Angle Torch Flashlight $54.95 Waterproof To 400 Ft; Anodized Aluminum Construction; 6W Lifetime Luxeon® Led Light; Magnetic Switch ; Triple O Ring Protection; 3.5-Hour Burn Time ; 70 Lumens; Includes Carrying Strap, 2 Cv123 Batteries & Holster... |
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Pelican Pelican Versabrites 353248 "The smaller Versabrite produces a 6000 candlepower beam with the Xenon lamp module. The Versabrite II produces an 8000 candlepower beam with the larger Xenon module. Both lights feature swivel heads, belt clip and made from unbreakable resins. Batteries... |
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Canon WP-DC13 Waterproof Case for Canon SD1000 Digital Camera $159.50 With the Canon WP-DC13 waterproof case you can use your PowerShot SD1000 digital camera to take underwater photos at depths of up to 130' (40 m). Of course it is also ideal for taking worry-free pictures in the rain, at the beach, or on the ski slopes.... |
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DIGITAL LUGGAGE SCALE Portable Light Weight Scales Postal Weigher NEW from Travelite. $21.48 Lightweight, compact and durable, the TraveLite Luggage Scale is designed to save todays travelers money and hassle. Clearly displays the precise weight- up to 100lb, yet only weighs 7 ounces. The exclusive EZ Weigh indicator protects against overage fees by instantly showing if over the 50 lb limit. Includes built in LED flashlight and a Five Year Unconditional Guarantee. Know Before You GoTM Wit... |
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Ikelite DS51 Digital Strobe The compact lightweight and affordable Ikelite DS51 Substrobe is an excellent choice for any underwater photographer. Its digital electronics make it fully compatible with digital cameras as well as traditional film cameras such as the Nikonos. The DS51's intensity and angle of coverage make it equally suited for macro and general photography. The strobe's wide-angle diffuser increases the angle-o... |
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BGSD Women's Lambskin Leather Scuba Jacket - Misses, Petite, Plus A sleek, soft lambskin leather, scuba-style jacket is shaped with contoured seams.... |
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Phistic Women's Wing Collar Lambskin Leather Jacket - Misses & Petite Ultrafeminine shape is fashioned in supple lambskin leather with a convertible wing collar, zip front, and rivet detailing.... |
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Cruzer Women's Cowhide Leather Motorcycle Jacket - Misses & Petite Sleek, fitted leather motorcycle jacket. Zip-front jacket has banded collar with a snap. Horizontal chest pockets with zipper. Vertical front pockets. Long sleeves have zippered cuffs.... |
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Cressi Men's Pluma Closed-Foot Diving Fin (Blue, 10/11) $22.95 Pluma is a classy design that locates the swimmers foot completely inside the foot pocket, offering exceptional comfort and enhanced performance. Three thermoplastic materials are in the high tech design of the Pluma.... |
