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Unit 7 Topic 4
Using Unity Formulae
What is the Al2O3 : SiO2 (Al : Si) ratio?
The Al2O3 : SiO2 ratio represents the proportional relationship between the alumina and the silica values in a unity formula.

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The Al2O3 : SiO2 ratio is the firing temperature of the glaze.
The Al2O3 : SiO2 ratio tells how much silica should be included in the glaze for each molecule of alumina.
The Al2O3 : SiO2 ratio is the number resulting when the alumina value is divided by the silica value in the unity formula.
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