High Bridge Pottery Posted October 13, 2015 Report Share Posted October 13, 2015 Can somebody please check my maths 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? Link to comment Share on other sites More sharing options...
PeterH Posted October 13, 2015 Report Share Posted October 13, 2015 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/ Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted October 13, 2015 Author Report Share Posted October 13, 2015 Thank you Peter, I don't think there was any logic. I tried to quick dry 50ml of glaze and got a value of 42.3g so 84.6g for 100ml. Close to the 83.333 they say for 1.5sg Link to comment Share on other sites More sharing options...
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