This is the subject of Metrology,the science of measurement.There is a method to specify the product.This is one of the crucial point in the German standard of measurement.
202280
For the publications you will need a technical library.\n\nThe most recent ISO Standards publication list can be found at: http://isotc213.ds.dk/newstand.htm
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Every measurement has an uncertainty.  Measuring distance with a laser for example is affected by the wavelength of the laser which can be changed by air density.   Temperature affects the length of all materials.  Even outer space has distortions due to gravity of the stars and planets, gas clouds etc.
167480
Theoretically, you are correct. However small the additional weight is in one pan, the beam must rotate till it comes to vertical position.\n\nIn practice, the pivot about which the beam turns is not exactly at its center point.\n\nHowever we can make it as close as it is possible.\n\nNext is the sharpness of the pivot. Theoretically it should be a point. But with a microscope we will see it is some what blunt.\n\nAnother thing is mass distribution on both sides of the beam should be uniform. There is practical limit.\n\nBecause of these imperfections a small additional weight placed in one pan makes the moment about this small deviated point of the center equal to the moment of the less weight placed in the other pan.\n\nThis is called sensitivity of the balance. By careful manufacturing process we increase this accuracy.\n\nKeep a foot scale on your index finger and balance it. Since the finger has some width, you can easily balance it. The center of the scale can be displaced to some extent. \nBut it will be difficult to balance it on a sharp edge.  Depending upon the sharpness the sensitivity increases.\n\nIf every thing is nearly perfect the beam should oscillate about a mean position.
313589
Because 100% of the time it is cheaper than what it is being compared to. So they want the buyer to be aware of the fact that the two products do indeed compare to each other and hopefully the buyer will get their product instead of the more recognized, and more expensive, product. Hope this helps.
469732
it means exactly what it says ... which quantities are the same in the problem and what usits are used to measure them
90548
Now this is one of clumsier compound words in German, which has to be broken up:\nYou are right as regards the "nutrional value" bit. As to the rest:\nKennzeichnung = (here) declaration\nRichtlinien   = regulations, bye-laws\nNow you can put it together yourself
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========\n\nApparently purity, calculation or measurement errors have been there.\n\nYou repeated the thrice from the same solution to get an average.\n\nTry another solution.
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they aren't used to measure the same thing~ gram is the SI unit for mass + teaspoon is used to measure volume (size)
270526
They are designed to make it complicated... lol... no seriously they break the act down and make it more specific, less likely to be misinterpreted. It makes it more specific to the industry also. I guess the over all goal is to make things better, more standardised... "universal"
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Here's a nice explanation:\nhttp://www.4to40.com/QA/index.asp?counter=382&category=science
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Please check the following website for details\n\nhttp://www.scientificconsultingcompany.com/products.html
29056
Its' probably a rounding error. It would depend on which masses for the elements you use, how precise you want to be.
381906
You got it backwards - inches and feet, and quarts and gallons and etc, etc, are practically ancient units that someday, I hope, the metric system will replace entirely.  I don't know why there is so much resistance to this here in the US, but the attempt has been going on for decades.  I'm sick of having to have 2 sets of every type of wrench and socket, and always having to guess which one goes to some particular fastener on my car, which contains some metric, some SAE.
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Check the following link on Wikipedia.\n\nThe basic manufacturing process is explained on the page.\n\nUse your own common sense to try and develop quality controls at various stages that have been indicated in the wikipedia link.\n\nI am sure that there must some basic standards about the product specified by the authorities.\nIn India, we have the Bureau of Indian Standards that spells out the minimum parameters that are to be met by any product or service.\n\nI am sure that the US has Underwriters Lab, or some other body that has specified the minimum quality standards. Get hold of the standards, and if it's difficult for you to specify the standards, then ask the shoe polish equipment manufacturer to define them for you.
1338
No it is not.  Go here and look at it yourself.\n\nhttp://www.walter-fendt.de/m11e/line3d.htm
366262
the math is ok. what seems to be the problem?\n\nI think one ans is in CGS and another is in SI unit.
436204
tiny amounts of chemical can stick to differnt things, like stir bar, stir rod, thermometer and if you remove these items before the experiment is over then you remove some chemicals.  Other kinetics events that your not considering. as in pressure, humididtym and so on.  If you used a Ph probe then maybe it wasn't calibrated right or isn't properly maintained