Survivalist Pro
Survivalist Pro
Photo: Daniel Torobekov
Humans cannot breathe underwater because our lungs do not have enough surface area to absorb enough oxygen from water, and the lining in our lungs is adapted to handle air rather than water. However, there have been experiments with humans breathing other liquids, like fluorocarbons.
Selfishness really seems to have its roots in the term narcissism. It is a behavior that is both genetic and environmental. It is maintained by...
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Once we have food, water and shelter we must feel safety, belonging and mattering. Without these 3 things humans crave we can not get in their...
Read More »One thing about chemicals is that, once they react in certain ways, they form compounds that are nothing like the original elements. For example, if you react carbon, hydrogen and oxygen together one way you get glucose (C6H12O6) (see How Food Works). If you react them together another way you get vinegar (C2H4O2). If you react them another way you get fat (see How Fat Works). If you react them another way you get ethanol (C2H5OH). Glucose, fat, ethanol and vinegar are nothing like each other, but they are all made from the same elements. In the case of hydrogen and oxygen gas, if you react them together one way you get liquid water (H2O). The reason we cannot breathe liquid water is because the oxygen used to make the water is bound to two hydrogen atoms, and we cannot breathe the resulting liquid. The oxygen is useless to our lungs in this form. The oxygen that fish breathe is not the oxygen in H2O. Instead, the fish are breathing O2 (oxygen gas) that is dissolved in the water. Many different gases dissolve in liquids, and we see an example all the time in carbonated beverages. In these beverages, there is so much carbon dioxide gas dissolved in water that it rushes out in the form of bubbles. Fish "breathe" the dissolved oxygen out of the water using their gills. It turns out that extracting the oxygen is not very easy -- air has something like 20 times more oxygen in it than the same volume of water. Plus water is a lot heavier and thicker than air, so it takes a lot more work to move it around. The main reason why gills work for fish is the fact that fish are cold-blooded, which reduces their oxygen demands. Warm-blooded animals like whales breath air like people do because it would be hard to extract enough oxygen using gills. Humans cannot breathe underwater because our lungs do not have enough surface area to absorb enough oxygen from water, and the lining in our lungs is adapted to handle air rather than water. However, there have been experiments with humans breathing other liquids, like fluorocarbons. Fluorocarbons can dissolve enough oxygen and our lungs can draw the oxygen out -- see the last link below for some fascinating details!
0:56 Canadian sniper sets record for longest confirmed kill in military history. “Canada has the best sniper training program in the world. Jun 24,...
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Perfect Foods. (Image credit: XuRa (opens in new tab) | shutterstock (opens in new tab)) ... Beans. (Image credit: USDA) ... Kale. (Image credit:...
Read More »Roger Chapman Roger Chapman, who has died aged 74, survived the world's longest, deepest underwater rescue. In the early hours of August 29 1973, Chapman and Roger Mallinson, pilots of Pisces III, a submersible six feet in diameter, began a routine dive to 1,600 ft, some 150 miles south-west of Cork.
Roger Chapman, who has died aged 74, survived the world’s longest, deepest underwater rescue. In the early hours of August 29 1973, Chapman and Roger Mallinson, pilots of Pisces III, a submersible six feet in diameter, began a routine dive to 1,600 ft, some 150 miles south-west of Cork. Their task was to use waterjets to liquefy the mud and bury a transatlantic telephone cable. With the job done after eight hours, Pisces III was about to be lifted into their mother ship, Vickers Voyager, when the towline snagged and wrenched open the hatch to a self-contained compartment. Water flooded in and Pisces III sank to the seabed; at 175 ft the towline broke, and as the submersible plunged to the bottom, the pilots shut off the electrical systems, released a 400 lb ballast weight and braced themselves for impact. They hit the bottom at about 40 mph, their vessel burying itself stern-first in the mud at an angle of 85 degrees. They had about three days of oxygen left, a sandwich and a can of lemonade. They made themselves as comfortable as possible, Chapman recalling: “Our job was to act as vegetables most of the time, but still perform as intelligent human beings every half an hour for essential life support jobs.” As they became drowsy, an international rescue commenced. The survey ship Hecate arrived on the scene; Pisces II was brought from the North Sea, while the US Navy flew in its Controlled Underwater Recovery Vehicle, CURV-III, and the Royal Canadian Navy their Pisces V.
An individual planning to become a hacker will need to learn about programming, which is considered to be a vital step. A variety of software...
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According to the National Renewable Energy Laboratory, homes with solar panels sell 20% faster and for 17% more than those without.
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Weevils, also known as flour bugs or long-snout bugs, infest flour, rice, cornmeal, and other dry goods in the pantry. Several types of weevils can...
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While Bedouin fighter Zara Ghufran is a fictional character, she is based on real women who served in the Arab revolt against the Ottomans. Oct 21,...
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