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#81
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Tony writes:
It is not its pH that makes urine corrosive, but the dissolved salts that become reactive. That's why cars that are close to the oceans rust more quickly than do those in rainy inland locations. Urine isn't usually terribly concentrated. Some of the byproducts of urine that are produced after exogenous microorganisms attack it (such as ammonia) are much more damaging. -- Transpose mxsmanic and gmail to reach me by e-mail. |
#82
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Don't bother to argue with him, he knows everything about anything, and is a
world expert on the whining backchat. "RomeoMike" wrote in message ... Mxsmanic wrote: RomeoMike writes: Well, you may get thirsty before dehydrating while playing with your joy stick, but people who work and play in hot climates know that that is not true. I was born and raised in a desert. You get thirsty when you get dehydrated; it is an extremely reliable indicator of dehydration. Physiologists know that dehydration can precede thirst. Only under very unusual circumstances of rapid water loss, which are not likely to ever occur while flying a general aviation aircraft. Essentially, you have to be vomiting, urinating, experiencing diarrhea, or perspiring profusely to dehydrate that rapidly. None of these is very probable in an aviation context. The military knows it in training troops. Pro sports teams know it. Serious hikers know it. None of them are pilot GA aircraft, however, and there is no comparison. You're no more likely to dehydrate significantly in an aircraft than in a car. All plan appropriate water consumption based on planned fluid losses, not thirst. Only when TBW losses are expected to be extremely rapid. That does not apply to general aviation. You also imply in another post in this thread that the kidneys won't make urine if one is dehydrated: They will concentrate as much as they can. If dehydration is extreme, however, they will go into acute renal failure. Again, however, this is never likely to occur in an aviation context. If it burns when you urinate, that's one sign that you are seriously dehydrated. A simple test is to make sure your bladder fills every 3-5 hours, and check to make sure that your urine is not brightly colored. If it is lightly colored and you urinate at least with this frequency, it's unlikely that you are significantly dehydrated. That's not so either, unless you're going into shock. It's normal physiology. Well, it's normal that normal physiology is normal, but you don't know what that normal is. I'm not going to address your ignorance further for the same reasons that others have given up on you. I only responded to suggest to anyone interested in the topic that they not take those statements of yours that I quoted as factual. They should go read an authoritative source about a topic that can be vitally important to some. As for you, who has never even had a flying lesson let alone piloted a plane, you even have the hubris to suggest to an ex-fighter pilot how to recover from a stall. LOL |
#83
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The bridge mentioned earlier will take comfort in that.
On Jan 26, 12:51 pm, Mxsmanic wrote: Tony writes: It is not its pH that makes urine corrosive, but the dissolved salts that become reactive. That's why cars that are close to the oceans rust more quickly than do those in rainy inland locations.Urine isn't usually terribly concentrated. Some of the byproducts of urine that are produced after exogenous microorganisms attack it (such as ammonia) are much more damaging. -- Transpose mxsmanic and gmail to reach me by e-mail. |
#84
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![]() On Jan 26, 12:49 pm, "Tony" wrote: Sigh. It is not its pH that makes urine corrosive, but the dissolved salts that become reactive. That's why cars that are close to the oceans rust more quickly than do those in rainy inland locations. Tony, Here is another example of the corrosive effect of urine http://tinyurl.com/26ghv8 "On the pitting corrosion of high strength aluminium alloys by rat urine Sreekumar, K; Jacob, E; Natarajan, A; Lakshmanan, T S Praktische Metallographie (Germany). Vol. 34, no. 9, pp. 478-481. Sept. 1997 High strength AFNOR 7020 aluminium alloy sheets in T6 condition are used for fabricating propellant tanks (nitrogen tetroxide N sub 2 O sub 4 and unsymmetrical dimethyl hydrazine UDMH) for launch vehicle applications. These tanks are fabricated through welding route and are filled with dry nitrogen gas at 300 mbar and sealed at both ends. The tank is then cocooned with aluminised plastic sheets and stored under positive dry nitrogen gas pressure. During the storage rats had cut open the aluminised plastic sheets and had urinated all over the surfaces of the aluminium alloy tank. The tank surface showed discolouration and severe pitting corrosion attack wherever the rat urine had come in contact with it. This paper highlights the investigations made to understand the severity of the corrosion attack on the surface of the tank with a view to clear it for further processing and utilisation. I'd bet someone will argue that rat urine is not the same as human stuff. The counter argument is that some people are considered 'dirty rats' ;-) By the way, the pH level of human urine can range from 4.5 to 8 and normal urine is slightly acidic. |
#85
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![]() "Mxsmanic" wrote in message ... Thomas Borchert writes: You mean, regularly spraying a highly corrosive fluid onto the underside of your plane, which then creeps in through every opening and seam, sounds good? I don't get it... Urine is not highly corrosive. It's mostly sterile, dilute salt water with a bit of urea, and a neutral pH. Quit demonstrating your stupidity or cite your sources, such as: Read the last line twice... http://www.nlm.nih.gov/medlineplus/e...cle/003583.htm ....pH is a measure of how acidic or alkaline a fluid is, like blood or urine. The pH in blood is maintained within the narrow range of 7.35 to 7.45. Your body maintains this narrow range by using buffers -- chemicals that can switch back and forth between 2 forms, a weak acid or weak base. The buffers are only temporary "stop gaps" to avoid dramatic changes in blood pH. Long-term correction of blood pH requires the kidneys to excrete the acid or base in urine. For example, when your blood pH is low (acidic), your kidneys react by excreting more acid in the urine. The urine pH becomes more acidic until the blood pH returns to normal. In some cases, checking your urine pH is helpful for identifying body acid-base imbalances. In other cases, a blood pH test is needed. Your provider may want to modify your urine pH to help prevent kidney stones. Acidic urine is associated with xanthine, cystine, uric acid, and calcium oxalate stones. Alkaline urine is associated with calcium carbonate, calcium phosphate, and magnesium phosphate stones. Some medications are more effective in acidic or alkaline environments. For example, streptomycin, neomycin, and kanamycin are more effective in treating urinary tract infections when the urine is alkaline. Normal Values Return to top The normal values range from 4.6 to 8.0. |
#86
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Tony writes:
The bridge mentioned earlier will take comfort in that. People have been urinating on bridges for thousands of years, and I don't know of any that have collapsed as a result. -- Transpose mxsmanic and gmail to reach me by e-mail. |
#87
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Casey Wilson writes:
Long-term correction of blood pH requires the kidneys to excrete the acid or base in urine. The acid or base. QED. The normal pH is very close to 7 (neutral). Your provider may want to modify your urine pH to help prevent kidney stones. Acidic urine is associated with xanthine, cystine, uric acid, and calcium oxalate stones. Alkaline urine is associated with calcium carbonate, calcium phosphate, and magnesium phosphate stones. Acid, alkaline. See? The normal values range from 4.6 to 8.0. And the average is just about 7.0. -- Transpose mxsmanic and gmail to reach me by e-mail. |
#88
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![]() The acidity of urine isn't very important in terms of corrosion. An understanding of chemistry would lead you to conclude there simply isn't enough acidic strength in urine to make it an effective caustic. On the other hand, the salts are reactive, and become more so as the water matrix evaporates. As mentioned before, cars parted where salt water spray wets them are all of the demonstration of that an intellegent disinterested observer might need. Stong's Physical Chemistry text -- it's a pretty old book, but good -- will even allow you to put numbers to the analysis. It's, oh, more or less junior year college stuff -- can you handle that? On Jan 26, 3:29 pm, Mxsmanic wrote: Casey Wilson writes: Long-term correction of blood pH requires the kidneys to excrete the acid or base in urine.The acid or base. QED. The normal pH is very close to 7 (neutral). Your provider may want to modify your urine pH to help prevent kidney stones. Acidic urine is associated with xanthine, cystine, uric acid, and calcium oxalate stones. Alkaline urine is associated with calcium carbonate, calcium phosphate, and magnesium phosphate stones.Acid, alkaline. See? The normal values range from 4.6 to 8.0.And the average is just about 7.0. -- Transpose mxsmanic and gmail to reach me by e-mail. |
#89
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![]() Barney Rubble wrote: Don't bother to argue with him, he knows everything about anything, and is a world expert on the whining backchat. I'm avoiding his assertions regarding physiology scattered throughout this thread. He displays in them two bad proclivities. One is to run to the Internet to get a superficial and often erroneous impression of some topic and then post in an authoritative fashion based on that info. The other is to not be willing to alter his misconceptions if challenged. He digs himself further into a hole and gets more and more ridiculous. |
#90
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I just remembered something. I think it was with you that during a
discussion regarding the physics of a 1 G roll pointed you to a rather nice web page where someone using classical newtonian physics showed a family of loci that me that criterion, and you were unable to follow the analysis and so declared it invalid. That was simple physics, force equal mass times acceleration kinds of stuff. Here we're talking about the reaction dynamics in inorganic chemistry, and earlier, human physiology. Seems to me if you don't have the tools for the simple stuff -- that roll stuff is calculus that can be done long hand -- you don't have the tools for this either. You are good at taking singular facts and misapplying them. Is there a market for that skill in France? Here in the US we tend to elect such people to public office. Or, if they work for us, we fire them. I should badly doing this -- if MX was a cat I'd be cited for being cruel to animals -- but I don't. On Jan 26, 3:27 pm, Mxsmanic wrote: Tony writes: The bridge mentioned earlier will take comfort in that.People have been urinating on bridges for thousands of years, and I don't know of any that have collapsed as a result. -- Transpose mxsmanic and gmail to reach me by e-mail. |
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