I don't recall seeing anywhere the magnitude of the difference. However
that is addressed in #4 below as one of the possible sources of error.
That would be some useful information, or alternatively he should run a
series of measurements and produce a repeatability diagram. If he runs
say 10 measurements and they all lie within "X" of the mean, then he
does the same for the other and that mean is outside the mean +/- "X" of
the other, then he is likely outside the level of measurement error. Of
course to do it right, you mathematically compute the standard
deviation, then you can give the probability that the result is actual
or error.
Marshall
On 3/2/2011 9:55 AM, Dan Nave wrote:
Apparently, you think it is within the realm of possibility for
Neville to decant a volume of liquid repeatedly within an error of
less than 5 parts per million...
Dan
On Tue, Mar 1, 2011 at 9:02 AM, Marshall<mdud...@king-cart.com> wrote:
OK, then you were actually measuring a change in density instead of weight.
That would likely have been an decrease in volume then instead of a decrease
in weight.
This could be cause by any of the following:
1. scale accuracy
2. scale repeatability
3. temperature difference in the liquids at time of measurment.
4. pipette accuracy/repeatibility
5. actual density reduction
Actual density reduction could be due to temperature variation or a change
in the structure in the water. For instance if water crystallizes when
freezing, the density will drop about 10%.
Marshall
On 2/28/2011 5:37 PM, Neville Munn wrote:
Hope this doesn't come thru twice, had to cut.
Yep, sure.
2 Different solutions used: (a) 19 days old @ 12.1uS/006-7ppm, (b) 3 days
old @ 18.5uS/009-010ppm.
Step 1: Ensure digital scale was zero'd and reading in grams. Praps I could
have used 'ct' or 'gs' {which I assume is 'grain'} or 'dwt' {don't know what
that is}
Step 2: Weigh empty 30ml plastic medicine cup.
Step 3: Syringe 5cc/ml plain DW into cup...weigh that, then subtracted cup
weight from DW.
Step 4: Empty and dry cup thoroughly.
Step 5: Syringe 5cc/ml EIS into cup...weight that, then subtracted cup
weight from EIS.
Step 6: Subtact this result from the other.
N.
________________________________
Date: Mon, 28 Feb 2011 12:52:56 -0500
From: mdud...@king-cart.com
To: silver-list@eskimo.com
CC: frankcuns-r...@comcast.net
Subject: Re: CS>Wet weight?
Can you elaborate a bit more on your procedure?
Marshall
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