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The temperature of liquid nitrogen can readily be reduced to its freezing point −210 °C (−346 °F; 63 K) by placing it in a vacuum chamber pumped by a vacuum pump. [2] Liquid nitrogen's efficiency as a coolant is limited by the fact that it boils immediately on contact with a warmer object, enveloping the object in an insulating layer of ...
Helium may be added to reduce the amount of nitrogen and oxygen in the gas mixture when diving deeper, to reduce the effects of narcosis and to avoid the risk of oxygen toxicity. This is complicated at depths beyond about 150 metres (500 ft), because a helium–oxygen mixture then causes high pressure nervous syndrome. [1]
Researchers have found evidence of frostbite in humans dating back 5,000 years, in an Andean mummy. Napoleon's Army was the first documented instance of mass cold injury in the early 1800s. [7] According to Zafren, nearly 1 million combatants fell victim to frostbite in the First and Second World Wars, and the Korean War. [11]
There are many causes of infectious diarrhea, which include viruses, bacteria and parasites. [29] Infectious diarrhea is frequently referred to as gastroenteritis. [30] Norovirus is the most common cause of viral diarrhea in adults, [31] but rotavirus is the most common cause in children under five years old. [32]
Annually, norovirus causes 19 to 21 million cases of vomiting and diarrhea in the U.S., 465,000 emergency room visits, 109,000 hospitalizations, and 900 deaths, per the CDC.
Wilderness-acquired diarrhea is a variety of traveler's diarrhea in which backpackers and other outdoor enthusiasts are affected. Potential sources are contaminated food or water, or "hand-to-mouth", directly from another person who is infected. [1] [2] Cases generally resolve spontaneously, with or without treatment, and the cause is typically ...
Excess free water or hypotonic water can leave the body in two ways – sensible loss such as osmotic diuresis, sweating, vomiting and diarrhea, and insensible water loss, occurring mainly through the skin and respiratory tract. In humans, dehydration can be caused by a wide range of diseases and states that impair water homeostasis in the body ...
[17] [35] This is because nitrogen is five times more soluble in fat than in water, leading to greater amounts of total body dissolved nitrogen during time at pressure. Fat represents about 15–25 percent of a healthy adult's body, but stores about half of the total amount of nitrogen (about 1 litre) at normal pressures.