larryG Posted August 25, 2015 Posted August 25, 2015 Hi, Math is far from being one of my best subjects, so im looking for some help in this area. How can I measure the bulk density of a dry powder into cubic feet using a 1 cup measurement? Thanks for any help!
imatfaal Posted August 25, 2015 Posted August 25, 2015 Get an accurate measure of the mass of the material in the cup - so you have x grams GROSS. Weigh the empty cup. So you have y grams TARE Substract TARE from GROSS to get z grams NET Get an accurate measure of the volume that is held by the cup - easiest way to do this is to fill with water and re-weigh. Number of grams is equal to number of cubic centimetres. So you have W cubic centimetres. Density in grams/cubic centimetre is D = z / W There are a million cubic centimetres in a cubic metre so you need to divide by one million Density in grams/cubic metres is D/1,000,000 But there are a million grams in a metric tonne so to get the more normal measure of metric tonnes per cubic metre you are back at D = z / W
larryG Posted August 25, 2015 Author Posted August 25, 2015 Get an accurate measure of the mass of the material in the cup - so you have x grams GROSS. Weigh the empty cup. So you have y grams TARE Substract TARE from GROSS to get z grams NET Get an accurate measure of the volume that is held by the cup - easiest way to do this is to fill with water and re-weigh. Number of grams is equal to number of cubic centimetres. So you have W cubic centimetres. Density in grams/cubic centimetre is D = z / W There are a million cubic centimetres in a cubic metre so you need to divide by one million Density in grams/cubic metres is D/1,000,000 But there are a million grams in a metric tonne so to get the more normal measure of metric tonnes per cubic metre you are back at D = z / W So my sample powder weighs 7.4oz in the measuring cup. When converting it to cubic feet per pound, I come up with 62lbs which can't be right because my sample is very fine almost like flour.
imatfaal Posted August 25, 2015 Posted August 25, 2015 Heaven help us with these antiquated weights and measures. I had forgotten that a cup is a unit of volume ounces to pounds --> ounces * 0.0625 = pounds cups to cubic feet --> cups * 0.008355 = cubic feet 7.4 ounces * 0.0625 = 0.4625 pounds 1 cup * .008355 = .008355 cubic feet Density is mass (ie pounds) divided by volume (ie cubic feet) Density = 0.4625 / 0.008355 = 55.4 pounds per cubic foot FYG flour is about 35-45 pounds per cubic foot 1
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