How to measure the density of viscus liquids? please suggest some simple method.
Dear Billa,
The accurate volume determination of a viscous material with entrapped air can be determined by a method that involves diluting and mixing a sample of the material with an acceptable diluent (thinner). This diluting and mixing frees the viscous material sample of entrapped air. A standard weight-per-gallon cup can be filled with the diluted and mixed materials and weighed. The procedure to determine the density of a viscous material with entrapped air is illustrated in these drawings.
For the drawings, see the following link:
https://www.gardco.com/pages/density/density_determination.cfm
Mixing a diluent (A) with a sample of the viscous material (W) frees the entrapped air. The weight-per-gallon cup (B) contains a level-full amount of the diluent-viscous material mixture. The true weight per gallon of the viscous material without entrapped air can then be calculated from the formula listed here.
X = W x B/ W + A - (10 x B)
X is the unknown lb/gal density of the viscous material.
W is the measured gram weight of the viscous material sample.
A is the gram weight of the diluent from a full weight-per-gallon cup.
10 is the multiplier to convert "B" into gram weight of a filled weight-per-gallon cup of the viscous material.
The method has been confirmed in the laboratory by using two materials of widely different densities. The amount of the unknown material (W) was varied greatly. The calculated weight per gallon (X) throughout the range of 25 grams to 125 grams of the unknown was always within 0.5% of the known true value. The weight-per-gallon cups are available in corrosion-resistant materials. One such cup is produced with a sidewall of series 316 stainless steel and a machined bottom and closely fitted lid of series 416 stainless steel. A radiused area where the bottom is secured to the sidewall provides ease of cleaning. The lid is formed with a small opening to permit discharge of excess material to ensure exact specified volume of the cup contents. The cups are warranted to be within 0.5% of specified volume. Cups are available that qualify for volume certification under MIL STD 45662 and exceed the requirements of ASTM methods.
Cups of other volumes are available, including a "mini" cup that is one-tenth the U.S. standard cup. Another cup readily converts pounds and imperial gallons. These cups can also be used in this indirect computational method of measurement provided the correct multiplier is used in the equation for "B."
To view the figures and examples, please use the following link:
https://www.gardco.com/pages/density/density_determination.cfm
Hoping this will be helpful,
Rafik
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