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River Otter
Skeptic Friend
USA
67 Posts |
 Posted - 02/04/2010 : 12:50:35
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I am researching the metric system and learning how to use it in my Chemistry class. I have found the history quite interesting.
I have a question about some missing decimals (0.0001 & 0.00001)in the Metric Prefix Table.
I am wondering WHY they are missing, as I haven't found a table yet, with them on it.
Your help is appreciated.
Metric rocks!
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I am not ashamed to confess that I am ignorant of what I do not know. -Cicero
Brother, You say there is but one way to worship and serve the Great Spirit. If there is but one religion, why do you white people differ so much about it? Why not all agree, as you can all read the book. -Sagoyewatha,(Red Jacket) - Chief and great orator of the six nations. |
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BigPapaSmurf
SFN Die Hard
3192 Posts |
 Posted - 02/04/2010 : 13:08:19 [Permalink]
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.001 = milli
.000001 = micro
.00001 = 10 micro
.0001 = 100 micro
I not sure there are any prefixes for the inbetweens.
Edit:
I suppose you could say...
.00001 = dekamicro
.0001 = heptomicro
But that would be confusing.
Edit 2:
WHY = because they are unnessisary |
"...things I have neither seen nor experienced nor heard tell of from anybody else; things, what is more, that do not in fact exist and could not ever exist at all. So my readers must not believe a word I say." -Lucian on his book True History
"...They accept such things on faith alone, without any evidence. So if a fraudulent and cunning person who knows how to take advantage of a situation comes among them, he can make himself rich in a short time." -Lucian critical of early Christians c.166 AD From his book, De Morte Peregrini |
| Edited by - BigPapaSmurf on 02/04/2010 13:34:47 |
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Dr. Mabuse
Septic Fiend
Sweden
9688 Posts |
Posted - 02/04/2010 : 13:52:10 [Permalink]
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| What he said... |
Dr. Mabuse - "When the going gets tough, the tough get Duct-tape..."
Dr. Mabuse whisper.mp3
"Equivocation is not just a job, for a creationist it's a way of life..." Dr. Mabuse
Support American Troops in Iraq:
Send them unarmed civilians for target practice..
Collateralmurder. |
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River Otter
Skeptic Friend
USA
67 Posts |
Posted - 02/04/2010 : 21:48:48 [Permalink]
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Thanks BigPapaSmurf[b/] & [b]Dr. Mabuse for your replies. You brought a little light to my question and should help me with my research paper.
I see how using the multipliers 0.0001 & 0.00001 would be confusing. I am having a hard time wrapping my brain around 10 micro and 100 micro.
A quick shout out to the administrators for getting my avatar up. Thank you  |
I am not ashamed to confess that I am ignorant of what I do not know. -Cicero
Brother, You say there is but one way to worship and serve the Great Spirit. If there is but one religion, why do you white people differ so much about it? Why not all agree, as you can all read the book. -Sagoyewatha,(Red Jacket) - Chief and great orator of the six nations. |
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Ricky
SFN Die Hard
USA
4907 Posts |
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BigPapaSmurf
SFN Die Hard
3192 Posts |
Posted - 02/05/2010 : 09:01:01 [Permalink]
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Originally posted by River Otter
Thanks BigPapaSmurf[b/] & [b]Dr. Mabuse for your replies. You brought a little light to my question and should help me with my research paper.
I see how using the multipliers 0.0001 & 0.00001 would be confusing. I am having a hard time wrapping my brain around 10 micro and 100 micro.
A quick shout out to the administrators for getting my avatar up. Thank you
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Its easier to think of it this way
.000001m = 1 micron
.000010m = 10 microns
.000100m = 100 microns
Edit:Perhaps they should have taken the same route as with the whole numbers (114,000.000,230) |
"...things I have neither seen nor experienced nor heard tell of from anybody else; things, what is more, that do not in fact exist and could not ever exist at all. So my readers must not believe a word I say." -Lucian on his book True History
"...They accept such things on faith alone, without any evidence. So if a fraudulent and cunning person who knows how to take advantage of a situation comes among them, he can make himself rich in a short time." -Lucian critical of early Christians c.166 AD From his book, De Morte Peregrini |
| Edited by - BigPapaSmurf on 02/05/2010 11:16:39 |
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Dr. Mabuse
Septic Fiend
Sweden
9688 Posts |
Posted - 02/05/2010 : 14:07:44 [Permalink]
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| Though I think using comma sign to denote thousands is one of those non-ISO standard things. We don't use them in Sweden. If at all, at least I use ' as in 144'000,000230. |
Dr. Mabuse - "When the going gets tough, the tough get Duct-tape..."
Dr. Mabuse whisper.mp3
"Equivocation is not just a job, for a creationist it's a way of life..." Dr. Mabuse
Support American Troops in Iraq:
Send them unarmed civilians for target practice..
Collateralmurder. |
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ktesibios
SFN Regular
USA
505 Posts |
Posted - 02/05/2010 : 14:47:19 [Permalink]
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IIRC, Dr Mabuse is an electrical engineer. If you work in the electronics industry for a while, the engineering prefixes (milli, micro, nano and so forth) become very familiar and comfortable.
I use 'em as a handy substitute for the "x * 10y" format of scientific notation when I'm doing ciphering in my head.
For example, if I want to estimate the cutoff frequency of a first-order RC filter made up of a 10 kohm resistor and a 100 nanofarad capacitor I wind up thinking it out like this:
"OK, 10 kilo times 100 nano is 1,000,000 nano- that's 1 milli."
"times 2 times pi, that's about 6.28 milli"
"1 divided by 6.28 milli... should be just about 160 Hz".
If River Otter's chem class includes enough problems using SI units, s/he should find this kind of thinking actually comes pretty natural.
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"The Republican agenda is to turn the United States into a third-world shithole." -P.Z.Myers |
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River Otter
Skeptic Friend
USA
67 Posts |
Posted - 02/10/2010 : 19:53:11 [Permalink]
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| Though I think using comma sign to denote thousands is one of those non-ISO standard things. We don't use them in Sweden. If at all, at least I use ' as in 144'000,000230. |
My instructor told us that the comma isn't used anymore. I can't remember exactly why though. I think the comma could be confused with other punctuation. We write all of our large numbers using spaces keeping the numbers in groups of three from right to left. (1 000 000)
I turned in a paper using the information that was given to me by BigPapaSmurf along with what I found other places.
I learned that the prefix for 10 to the 4th, had at one time, been called Myra, but now is obsolete and not considered a SI unit.
I couldn't find any prefixes for 10 to the 4th, -4th, or -5th.
I hope to get my paper back next week and see what he says.
Thanks for your help everyone.
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I am not ashamed to confess that I am ignorant of what I do not know. -Cicero
Brother, You say there is but one way to worship and serve the Great Spirit. If there is but one religion, why do you white people differ so much about it? Why not all agree, as you can all read the book. -Sagoyewatha,(Red Jacket) - Chief and great orator of the six nations. |
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Dave W.
Info Junkie
USA
26022 Posts |
Posted - 02/10/2010 : 20:05:47 [Permalink]
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Originally posted by River Otter
My instructor told us that the comma isn't used anymore. I can't remember exactly why though. I think the comma could be confused with other punctuation. |
It's because those silly Europeans starting using a comma instead of a period for the decimal point, giving us ridiculous constructions like "Toilet Paper: 2,49" which look like Cartesian coordinates instead of prices. 
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- Dave W. (Private Msg, EMail)
Evidently, I rock!
Why not question something for a change?
Visit Dave's Psoriasis Info, too. |
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Any Mathematicians around here?
