14 October 2014

TO ADD A FIXED PERCENTAGE BY DRY WEIGHT OF STAIN TO A GLAZE SLOP OF KNOWN RECIPE

PROBLEM
To determine the weight of dry matter in the glaze slop.

SOLUTION
By Brongniart's formula W = G(L-1000)/(G-1) calculate weight of dry matter in the glaze slop.

Where:
W = the dry weight of matter in the slop
L = the weight in grams of a litre of the slop
G = density of the dry matter relative to water (its relative density)

W is to be determined
L may be determined by measurement
G is unknown

Therefore G must be determined.

To determine G:

G = (Wd/Vd)/1

Where:
Wd = weight of dry matter
Vd =volume of dry matter

Weight  Wd of dry matter may be determined by measurement.

But volume  Vd of a given weight of dry matter is not known.

Therefore Vd must be determined.

Determine by displacement: take 1 litre water; add a given weight of dry matter and stir; measure displacement  Vd in litres.

Calculate Wd/Vd.

Calculate G.

Calculate W.