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Specific Gravity To Calculate Dry Weight.


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Can somebody please check my maths :D Seem to think about this for a long time and keep getting confused.

 

If I have a specific gravity of 1.5 and I weigh out 250 grams of glaze, that means I have 100g water and 150g glaze?

 

Or another way, I get 111ml of glaze that would weigh 166.7g or 66.7g water and 100g dry glaze?

 

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I don't follow your logic, but suspect that you are after Brongniart's formula.

 

Unfortunately you need to know/guess the average specific gravity of the solid materials.

The first ref suggests ~ 2.5 for slips, while the second suggest ~2.65 for glazes.

 

http://tinyurl.com/pssors9

http://new.queensberryhunt.com/wp-content/uploads/2012/05/Slop-DryWeight_Final.doc

 

Hopefully somebody with practical experience will chip in.

 

Finally:

A few old newsgroup postings

http://www.potters.org/subject11877.htm

Note that different people use different unit (metric, UK imperial, US imperial), and

re-arrange the formula to suit the problem at hand.

 

A ceramics daily ref

http://community.ceramicartsdaily.org/topic/2991-wet-volume-vs-dry-volume/

 

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