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Topic: Making a graph, what scale should I use?  (Read 9383 times)

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Offline Hemidol

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Making a graph, what scale should I use?
« on: September 22, 2009, 08:21:10 PM »
I need to plot of the density vs. Wt. % concentration.

My values of density are:

0.9982
1.0178
1.0381
1.0592
1.0810
1.1036
1.1270

And my weight %:

0.00
5.00
10.00
15.00
20.00
25.00
30.00

I'm having trouble coming up with a scale that will make a nice graph. Does anyone have any ideas for the density scale (what I should start at and go up by)?

Thanks.

Offline Leeple Stays

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Re: Making a graph, what scale should I use?
« Reply #1 on: September 22, 2009, 10:05:58 PM »
If I were going to do the scale, I'd do the density by .200's and weight percents by 1's or 5's.

Offline Hemidol

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Re: Making a graph, what scale should I use?
« Reply #2 on: September 22, 2009, 10:53:54 PM »
A graph of this nature really doesn't work. Going up by this amount on the densitys just doesn't create a nice line with this data. It's basically a horizontal line.

Can I do this for my density (which is the y-axis).

Start at 0.00 then shoot up to .98 then go to 1.00, then 1.02, then 1.04, etc. etc. is this allowed or is this not allowed when graphing?

Offline billnotgatez

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Re: Making a graph, what scale should I use?
« Reply #3 on: September 23, 2009, 02:44:31 AM »
It is interesting that you have a density of 0.9982 and a weight % of 0.00.

Setting that aside -

I have seen graphs where the x-axis goes from 0.00 to 35.00 by incremented by 5.00 and the y-axis starts at 0.8000 to 1.2000 incremented by 0.0200. Sometimes with zero at the bottom of the y axis and a jagged y-axis line for a short distance to the .8000

Offline Borek

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Re: Making a graph, what scale should I use?
« Reply #4 on: September 23, 2009, 02:56:40 AM »
It is interesting that you have a density of 0.9982 and a weight % of 0.00.

Nothing strange - see http://www.chembuddy.com/?left=FAQ (scroll down the page to water density table).

And honestly I don't understand why there is any problem with making a graph. Start vertical axis at 0.99, go up to 1.13 with 0.01 incremement. (0,0) doesn't have to be included.
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Offline billnotgatez

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Re: Making a graph, what scale should I use?
« Reply #5 on: September 23, 2009, 02:59:22 AM »
@ Borek -- Thanks for the info

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