Density v/s Total Solids

do you know the density of the fluid without solids and the density of the solids? In milk is the total solids a mass percentage or volumetric? Is the percentage a measure of the solids relative to the liquid mass or the total mass? I would suspect it is relative to the total mass (though in soils measurements are based on the solids only mass).

If it is a mass basis percentage of the total suspension mass, then the concentration is mass of solids divided by 1200 kg. It can also be a mass ratio measurement in terms of solids per liquid mass. In which case it is the solids mass divided by 1200- solids mass. If molar concentration, then you need the mass per mole of solid and the density of the liquid, as it will be moles per liter. So i guess you need to describe what the total solid percentage means in milk.

Milk is essentially water with dissolved sugars, proteins, suspended & colloidal fats etc. Start by assuming the density of water to 1 kg/liter. 8.5% will then be 8500ppm i.e. 8500 mg/liter. This will give you the total mass of solids in the milk. Divide this by the volume of solids, and you'll get the density of the solids. Please note this is only approximate, because I don't know if you mean all the solids, including dissolved soilds like lactose, or only the suspended solids.

hi,

i can share with you what we do with ceramic slurries.

1. You should know (or get measured) the specific gravity of each of the components of the suspension i.e. solids and the liquid medium separately.

2. Measure the instant density of the suspension.

3. The formula used to calculate the solids in a slurry is (dc-dl)*sgs / (sgs-sgl) where dc=density of the composite slurry

dl=density of the liquid component

sgs=specific gravity of solids

sgl=specific gravity of liquids.

The result will give u grams solids per cc of slurry if density is in g/cc units. We work with water as the medium and a solids sg of 2.5...below are some results for your understanding. It is called the Brogniart's equation/formula. hope it is useful for you.

Density Dry wt Water (g/cc) (g) (g) in 1 cc of slip 1.50 0.83 0.67 1.51 0.85 0.66 1.52 0.87 0.65 1.53 0.88 0.65 1.54 0.90 0.64 1.55 0.92 0.63 1.56 0.93 0.63 1.57 0.95 0.62 1.58 0.97 0.61 1.59 0.98 0.61 1.60 1.00 0.60

chitwadgi.satish@yahoo.co.in