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Objective assessment of independently verified facts, concensus, and consistency. On the internet, it is generally good advice to be wary of uncited information.

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The dilemma you present is inherent to all topics found on the internet. All you or anyone can do is find a site that is well regulated, & to check your answers with other sources.

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You can't be certain how valid an answer is on a site like this where everyone is encouraged to provide answers.

It never hurts to do a little research on your own once you get an answer and see if the facts match up.

It also helps if people would mention where they got their facts.

And (this should be obvious) if a reply starts with something like "I'm not sure, but..." or "I think..."

And thanks to many helpful, responsible and knowledgeable people, incorrect information is often noticed and commented on.

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Please bear in mind, too, that some questions relate to very complex issues and no single answer will be right in an 'absolute' sense. Obviously, a question like 'What were the underlying causes of WW1?' isn't comparable to 'How many yards are there in a mile?' The question about WW1 is still a matter of scholarly research and debate, whereas the question about yards in a mile is quite different. (Having said that, some answers will certainly be inaccurate). With experience, you may be able to work out whether an answer is well informed - whether the person who wrote it seems to have done plenty of reading on the topic or not. You may be able to develop a the ability to recognize answers that are a repetition of what the answerer learned at high school, and may now remember inaccurately. Some answers may be based on guesswork, and you may be able to learn to recognize these.

In general, one should be cautious about accepting a simple answer to a question about things that are complicated.

If you need to be reasonably certain about the accuracy of an answer, you should do the necessary research in the ordinary way, and treat the answer(s) you get here as possibilities, not as definitive.

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If an answer is wrong, we hope someone with the right answer will fix it. You can report errors to the category supervisors.

Although an answer may not satisfy your question, in many cases it may indicate terms or corrections that will help locate your information.

Under US copyright law you can only use one or two sentences of someone else's copyrighted material and then only for specific purposes such as review, critique, or educational (see "fair use").

Even if it is your own copyrighted material, we still ask that you do not post more than one or two sentences. Anything you do post becomes part of WikiAnswers and any WikiAnswers Contributor can add, edit, or remove parts of it. This is essential to our "wiki" system of collaboratively growing FAQs. WikiAnswers Contributors can improve each other's answers. This wouldn't be possible if the original answerer wanted to keep the copyright to their answer.

So, I'm sorry to say, you cannot post copyrighted material whether you own it or not. If you posted your copyrighted text you'd be giving up the copyright. If you posted someone else's copyrighted text, we would need to remove it so we don't violate that person's legal rights.

If you have a FAQ of your own or see a FAQ on someone else's Web site that is copyrighted, here's what you could do. Post the questions as new WikiAnswers questions. In the answers, quote one or two sentences from the other site. Or even better, summarize the answers in your own words. Then link to the other site in the right hand column of the page under "More Information" where it says "Related Links." This would benefit WikiAnswers visitors and the owners of the copyrighted material.

WikiAnswers vs Yahoo! Answers - Both Great But... The key here is that on WikiAnswers the answer is dynamic. It can be edited and improved upon by multiple users, so that you have the most complete, well-rounded answer - with contributions from one or many different users.

Other key element is the merging of identical questions - so that when someone asks, "Why does a sliced apple turn brown?" and someone else asks, "Why did the inside of my apple turn from white to brown?" the questions will be merged into one; and in addition the answers will be combined, so that there are no repetitive questions and the result is a single, complete answer.

Yahoo! Answers, on the other hand, takes user questions and answers individually. There is no dynamic adding or improving to a single answer, but rather lists of answers submitted by individual users.

The three main differences in usage are the following:

1. In WikiAnswers the answer is all in one question (essentially one answer that can be improved on), whereas on Yahoo! Answers a question can have lots of people each contributing an answer. The best answer is chosen by the asker, or - failing that - by other users.
2. In WikiAnswers, one's question is continuously open for contributions; on Yahoo! Answers, however, your question is open for 3 days - or 7 days with deliberate extensions - though some celebrities might have questions open for a month.
3. In WikiAnswers, a question is limited to 200 characters, whereas on Yahoo! Answers, while there is a similar limit, the questioner can add details that others can't remove.

More opinions from our users:

• Each website offers users a unique experience in the realm of Q&A. Thanks for participating!
• WikiAnswers is better. Yahoo! Answers is too complicated and you have to have avatars and stuff, which is lame.
• I prefer Yahoo! Answers. You get a Top Contributors badge, Contacts, Interaction with other users, points, spell check and the information is more accurate. But Yahoo! Answers does have bad-quality, considering the layout of the site and a lot of Internet trolls. This site however looks quite deserted. I haven't interacted with any users on this site. I only log in once every year.
• Yahoo! Answers does have the fact that it probably has more users (automatic Yahoo! account). However, WikiAnswers has some features YA doesn't have, such as ever going answers to questions, community driven (only a small group of people are working for WA, and they are part of the community). Also there is more human-to-human (through computer) interaction on WA since you can use the message board of any given user. There isn't a race to answer the most questions, or to have the most points, but the main focus is more on the quality (which by the way, can bring more rep points).
• WikiAnswers is almost perfect.
• Yahoo! Answers is almost perfect too, although you need points - which can be annoying.
• The strength of WikiAnswers can also be a weakness. Because anyone can edit answers, including unregistered IP users, nonsense and irrelevant answers can be posted, and even remain for some time.

  The time and use restrictions of Yahoo! Answers means that questions tend to be less frivolous (but not always), and there are few insults or foolish responses. The drawback is that there is less chance a good answer will be found within the allowable time window, and an asker may be given conflicting answers from which a correct one may be difficult or impossible to discern.

• I'd just like to briefly mention that Yahoo! Answers and WikiAnswers are both good places to find answers. However, it really does depend on the subject you are searching for. One of the things about WikiAnswers is that only one answer can be saved, which leads to situations like the one you see right now. However, WikiAnswers is definitely better monitored than Yahoo! Answers, at which you can find irrelevant and sometimes dumb answers. However, Yahoo! Answers does provide a good amount of personal insight and commentary for the answers. So it all boils down to the subject. Math, history, etc. - go for WikiAnswers. Easy, everyday stuff - Yahoo! Answers.
• WikiAnswers has Supervisors that monitor questions and answers for language, sexual content and personal attacks, something that is seen too frequently on Yahoo! Answers.
• While Yahoo! Answers has automatic censoring for even case-appropriate words like "ass" (male donkey) or "bitch" (female dog), which are rendered into "---" and "---" however the short time for answering questions seems to facilitate other vulgarities.
• I believe WikiAnswers is much better than Yahoo! Answers because most of the garbage and junk are filtered out and eliminated. Also, answers are compiled rather than being a dozen separate answers, all of which may have value, but only one is termed "best."
• WikiAnswers is better because there are more people and you don't have to sign up for an email account.
• Personally I think WikiAnswers is better, because more people visit WikiAnswers than Yahoo! Answers.
• As a result of a review of a number of questions and answers on both sites (primarily in the sciences), it's easy to say WikiAnswers has Yahoo hammered. There is no comparison. The WikiAnswers website does, in general, provide greatlysuperior (not just superior) answers to questions than the Yahoo! Answers site. The searchlight far outshines the flashlight.
• Yahoo! Answers is much better; I never run into unanswered questions.
• I think they are both great in a way.
• Yahoo is more popular then WikiAnswers, perhaps because they are faster at getting answered, as well as the preeminence of Yahoo - though that is changing.
• WikiAnswers is more accurate because Yahoo is like a competition to get the best answer.
• WikiAnswers filters better then Yahoo does.
• WikiAnswers creates a collaborative effort to get a good answer, rather than a dozen answers that have to be looked at and one 'picked.' However, with Yahoo Answers - as well as Answerbag and even Wikipedia - one can see previous answers.
• Yahoo Answers! has enjoyed much popularity (as has Answerbag - which might even be more popular than YA), but WikiAnswers seems to be increasing its popularity at an accelerated rate.
• WikiAnswers is better than Yahoo because we get the answer very soon and it is so clear....
• On WikiAnswers all you do is correct, improve and answer questions. BUT on Yahoo you can do all of these: create a personalized avatar; send messages to your friends; add friends/family/contacts; answer fun and easy and challenging questions; people can answer your own questions; the public can choose the best answer for your question; your question/answer gets rated; you can choose questions from different topics e.g., hair + beauty; there are polls and adverts, you can web search!
• Definitely WikiAnswers: It is easier to navigate; you can edit almost everything, even stupid questions and answers; no distracting advertisements; more people use the site, so you get faster results.
• Definitely Yahoo! Answers: There are friendly "Ask," "Answer" and "Discover" buttons at the top, along with an extremely easy-to-navigate "Categories" tree down the left side of the page.
• The comparison is tough, because there are a lot of "Help me" questions on Yahoo! Answer. It is very easy to navigate to your area and find a few interesting questions to answer. One feature that struck me with WikiAnswers is that once you type a question, you are offered a list of similar questions. With Yahoo! somebody asks "Which came first, the chicken or the egg?" every day and users rarely bother to search for other answers for the same question before posting.
• WikiAnswers, of course!! Was there any doubt????!!
• Yahoo! Answers, because of two words: "Best answer" (see the related link below).
• I totally disagree with the user above regarding Yahoo! Answers. I once asked a question that got 3 responses; I know, for sure, that none of the answers were right. Therefore, the answer that got voted as "Best answer" was misleading and, to boot, incorrect.
• When I ask questions on WikiAnswers, sometimes the question is already fully answered, with no wait! On Yahoo! Answers, I have to wait a couple days for the answers to come in, and the answers are usually short and sparse, if at all useful.
• It's not even a question! WikiAnswers combines everyones answers into one easy and awesome page that can be edited with new info every second!
• Yahoo! Answers has duplicate questions and opinions arguing with one another.
• If they battled it out, Yahoo would be so busy sorting who was up to bat that Wiki would knock them out before they had time to say "Help."
• Yahoo! Answers: it's faster to navigate and is more user- friendly. And it's easier to interact at Yahoo!
• WikiAnswers forever.
• Comparing the number of answers - the number of good answers - and the ease of use, it is not even a contest. At Yahoo! the same question may be asked over and over, and never get an answer. The correct answer may not be judged the "best answer" because it is done by unqualified voters. No attempt is made to prevent identical but rephrased questions which then receive different answers. As an unmoderated chat spot, Yahoo! is fine. But if you are looking for answers, ask here, on Answers.com.
• No question... WikiAnswers, of course!!!
• In my opinion I say WikiAnswers is better than Yahoo!
• Well, seeing as I'm using WikiAnswers, it's obviously attracted me. Yahoo! Answers, in my opinion, has too much garbage and too little filtering, too many wrong answers, and too much trolling. But WikiAnswers is well filtered with people answering quality questions. WikiAnswers is also growing in popularity, so Yahoo! Answers will probably die out in a while.
• Yahoo! Answers can be answered by anyone but the other answer can still be seen.
• WikiAnswers is a lot better. When i went to Yahoo! Answers I looked at the same question and most of them commented that they had never heard of WA before. So the only problem with WA is lack of public recognition. I'm not being biased; the first website that I found was Y!A, and hated it immediately I only visited Yahoo! for online chess. But when i found WA, I immediately made an account and began answering and sometimes questioning. One thing for WA to do is to make a better badging system... basically levels or extra badges in between Bronze and Silver contributors... To sum up: WikiAnswers is better in content, but worse in recognition.
• Both can be subjected to abuse, and answers must (of course) be treated with extreme caution. Yahoo! Answers is far more popular; it has a higher population of trolls, but also a higher population of "helpful" people who might not have any idea of a real answer, but who do a quick web search to post a quick popular answer to increase their ratings. Ridiculous answers can be voted in as the best possible answer (just clicking to vote for any one answer gives you a point, and there's no bonus for selecting the one that is finally chosen as best answer... Generally a single vote for your own answer is enough to guarantee success in the game).
• I like WikiAnswers better because you can see more than one answer to a question instead of voting which answer is the best, even if it's wrong on other sites. Each site has it's downfalls but WikiAnswers has people who greet new visitors, called WikiGuides. We also have Supervisors who you can contact if you need an answer right away or to contact to report bugs, vulgarity, intentionally wrong answers or if you have any other questions. We have a Teen group called WIT (WikiAnswers' Influential Teens). We have a community forum and are working 24 hours a day, 7 days a week, 365 days a year to make it a better experience for the visitor.
• Yahoo Answers is much better because people cannot change other people's answers or write nonsense. You can only choose to put your own answer. Additionally, there is a place to put your sources on Yahoo Answers, making it even more reliable. Many times I have asked a question on Wiki Answers and gotten a wrong answer. People also write nonsense or even inappropriate things.They could have changed someone's right answer. That is not the case on Yahoo Answers. I hope it's now very clear that Wiki Answers is not reliable and should not be used.
• Agreed, Yahoo is more reliable. I just use Wiki Answers my school computers don't block it. But use Yahoo for more accuracy . Plus you can see who answered on Yahoo better! But don't worry, I always answer the truth on WikiAnswers.
• I think that WikiAnswers is much better than Yahoo answers. It is much more efficient, having a single answer for a single question, as opposed to many contradicting ones. As said before, there are Community groups like the WikiGuides, WIT, and the SPA program that make contributing a lot of fun and provide an opportunity to get to know the site better. Although there are vandals and spammers, there is a Vandal Patrol and Supervisors that are constantly looking out and can block/warn them. People can provide a source on WikiAnswers through the 'related links' option. In addition, the silly questions that are often asked on Yahoo answers, if asked on WikiAnswers, can be deleted/trashed.
• WikiAnswers is better due to there being less vandalism to Yahoo Answers. The answers are given more accurately too. I also think that the system that WikiAnswers uses to moderate the content of the site is much better than Yahoo Answers because there are programs such as SPA, WIT, WikiGuides, Supervisors and Vandal patrol etc. It includes the community more than Yahoo Answers which seems to have a force of moderators that seem to not be able to tell the difference between someone asking a perfectly sensible question and someone asking a stupid question. Yahoo Answers also doesn't have enough moderators for the website size so they introduced the rule that if any user reports another users' answer or question, that answer of question will be removed from the website. This has resulted in users reporting the contributions of their rivals and overall reducing the quality of the site.

(For more information about WikiAnswers, click the Related Link below.)

These are used to measure flow rate.

With an orifice plate, the fluid flow is measured through the difference in pressure from the upstream side to the downstream side of a partially obstructed pipe. The plate obstructing the flow offers a precisely measured obstruction that narrows the pipe and forces the flowing fluid to constrict.

The orifice plates are simple, cheap and can be delivered for almost any application in any material.

The TurnDown Rate for orifice plates are less than 5:1. Their accuracy are poor at low flow rates. A high accuracy depend on an orifice plate in good shape, with a sharp edge to the upstream side. Wear reduces the accur

Due to simplicity and dependability, the Venturi tube flowmeter is often used in applications where it's necessary with higher TurnDown Rates, or lower pressure drops, than the orifice plate can provide.

In the Venturi Tube the fluid flowrate is measured by reducing the cross sectional flow area in the flow path, generating a pressure difference. After the constricted area, the fluid is passes through a pressure recovery exit section, where up to 80% of the differential pressure generated at the constricted area, is recovered.

With proper instrumentation and flow calibrating, the Venturi Tube flowrate can be reduced to about 10% of its full scale range with proper accuracy. This provides a TurnDown Rate 10:1.

The rotameter consists of a vertically oriented glass (or plastic) tube with a larger end at the top, and a metering float which is free to move within the tube. Fluid flow causes the float to rise in the tube as the upward pressure differential and buoyancy of the fluid overcome the effect of gravity.

The float rises until the annular area between the float and tube increases sufficiently to allow a state of dynamic equilibrium between the upward differential pressure and buoyancy factors, and downward gravity factors.

The height of the float is an indication of the flow rate. The tube can be calibrated and graduated in appropriate flow units.

The rotameter meter typically have a TurnDown Ratio up to 12:1. The accuracy may be as good as 1% of full scale rating.

Magnetic floats can be used for alarm and signal transmission functions.

The pitot tube are one the most used (and cheapest) ways to measure fluid flow, especially in air applications as ventilation and HVAC systems, even used in airplanes for the speed measurent.

The pitot tube measures the fluid flow velocity by converting the kinetic energy of the flow into potential energy.

The use of the pitot tube is restricted to point measuring. With the "annubar", or multi-orifice pitot probe, the dynamic pressure can be measured across the velocity profile, and the annubar obtains an averaging effect.

Difference between WikiAnswers and Yahoo! Answers:

Technically, the key difference is that this is a wiki where questions and answers can be improved over time. The community does more than just ask and answer questions. We grow the Q&A into FAQs which become useful for many people - not just the one person asking the original question.

Here is a personal answer from Deb: I'm glad someone asked this question because I'll be happy to tell what the differences are! One difference is that here on FAQ Farm, it's like a community: Everyone contributes by editing the questions and editing and adding to answers. Yahoo answers, from my limited experience, is nothing more than a board on which to ask a question.

Another difference is that here on FAQFarm, though our goal is to have one complete answer, we allow our Farmers to post as many answers as they like as long as they are still adding something to the answer. On Yahoo Answers, one person asks a question and it appears after getting three answers, the question is closed. If the information in the answers on FAQFarm is incorrect, someone can come behind the person and correct the answer. On Yahoo Answers, three individuals get to answer the question and if the information is incorrect, it stays incorrect. To me, while FAQ Farm is personal and fun, Yahoo Answers is impersonal and not much fun at all.

Aggie80 adds: Yahoo Answers is a competition, individuals attempting to answer to earn points. While one does sometimes get a good answer, they can be end up invisible due to voting and opinions. The 'Best Answer' gets highlighted and any good parts of other answers are neglected. No attempt is made to combine the knowledge of several individuals into a solid answer. And there is no self editing, anything that is posted is there for all to see, good or bad, and in some cases, even dangerous.

There are many differences but the main difference is that, on Yahoo Answers, many users can individually answer a question; but, on Wiki Answers, there can be only one answer, and the users can improve it. Yahoo Answers has a points-and- levels system. However, on Wiki Answers, a user's contributions are counted, and the user receives badges according to his/her contributions. Also, other users may confer trust points, which indicate the user's reputation and length of membership and on Wiki Answers.

"Prepone" IS actually a common term, an English word, but is not "American" English, hence not in the American dictionary. Used commonly in India.

'Prepone' is not an English word.

It's commonly used in Indian subcontinent to mean the opposite of 'post-pone', but the rest of the world is largely unaware of it.