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## Reading the spectrophotomer scale... - Chemistry Forum

### Reading the spectrophotomer scale... - Chemistry Forum. Discuss chemical reactions, chemistry.

#1
01-24-2004, 03:41 PM
 Sig Figure Guest Posts: n/a

Tony <[Only registered users see links. ]> wrote:

Are you saying that a Spec 20 gives 4 sig figs such as 0.238 (and
that 0.2385 is FIVE sig figs)? 0.238 has only THREE sig figs.
I'm tempted to give you a "<--Sig. Figs. -1" stamp but you might
come groveling for the point and say 'that's not what I meant'.

So, I'll take off 1 point for lack of clarity instead.

0.238 = 2.38 x 10^-1 3 sig figs
0.0238 = 2.38 x 10^-2 3 sig figs
0.0000000238 = 2.38 x 10^-8 3 sig figs
2.38 = 2.38 x 10^0 3 sig figs
23.800 = 2.3800 x 10^1 5 sig figs
238000000000 = 2.38 10^11 3 sig figs
2380000000000.0 = 2.3800000000000 10^12 14 sig figs
(compare: 2381043727094.3 has 14 sig figs)
(I'd look up some physcial constants such as c or h, but
I'm too tired.)

Before I get shot at for my previous post, I discussed reading
sig figs as a matter of accuracy, not precision. I'm ignoring
all other aspects of the instrumentation and just want to test
your meter reading skill. I could draw a bunch of pictures on
paper and quiz you on the accuracy of your reading the correct
value. ..54....|.........55..............56..

Or, I could dial in a voltage (54.3210 V) using a reliable
source and quiz you on meter readings off of a dial calibrated
in units "53 54 55 56". I would be looking for you to accurately
report "54.3". On a meter calibrated in 0.1 V (54.0 54.1 54.2 ...),
I'd be looking for "54.32".

--
Sent by xanadoof from yahoo subpart of com
Posted via [Only registered users see links. ]
#2
01-24-2004, 04:55 PM
 SNUMBER6 Guest Posts: n/a

>From: [Only registered users see links. ] (Sig Figure)

I successfully argued that a specification of 5 ppm maximum allowed was not
violated with a result of 5.4 ....
If it were written 5.0 ppm maximum allowable ... my argument would not have
flown ...

Be seeing you
In the Village
Number 6

#3
01-25-2004, 02:45 AM
 Tony Guest Posts: n/a

[Only registered users see links. ] (Sig Figure) wrote in message news:<[Only registered users see links. ].brandeis.e du>...

Not Likely, Shorty.

NFW = "No ****ing Way" soooo
And
The 5 refers to that digit at the end of 0.2385, *not*
5 Sig. Figs.

I knew I should not use acronyms in posts.
*sigh*

Cheers,
Tony

 Tags reading , scale , spectrophotomer

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