Question

a. Calculate the bulk density of the powder, DB, the porosity (pore volume per unit mass), P, and the % voidage for a powder sample under the following three packing conditions. The ppowder has a true density of 1.15 g/cm³. 1. Condition 1 (loose packing): a 35 gram sample of the powder is poured into a 100 ml graduated cylinder (to fill the cylinder). 2. Condition 2 (moderate packing): a 35 gram sample of the powder is poured into a 100 ml graduated cylinder (to fill the cylinder). The cylinder containing the loosely packed powder is tapped on the surface of the lab bench 3 times. The fill volume of the cylinder recorded is 45 ml i.e. the packed powder goes up to the 45ml line of the graduated cylinder. 3. Condition 3 (close packing): the cylinder containing the moderately packed ppowder from condition 2 is tapped on the surface of the lab bench an additional 47 times. The fill volume of the cylinder recorded is 38 ml.

          a. Calculate the bulk density of the powder, DB, the porosity (pore volume per unit mass), P,
and the % voidage for a powder sample under the following three packing conditions. The
ppowder has a true density of 1.15 g/cm³.
1. Condition 1 (loose packing): a 35 gram sample of the powder is poured into a
100 ml graduated cylinder (to fill the cylinder).
2. Condition 2 (moderate packing): a 35 gram sample of the powder is poured into
a 100 ml graduated cylinder (to fill the cylinder). The cylinder containing the
loosely packed powder is tapped on the surface of the lab bench 3 times. The
fill volume of the cylinder recorded is 45 ml i.e. the packed powder goes up to
the 45ml line of the graduated cylinder.
3. Condition 3 (close packing): the cylinder containing the moderately packed
ppowder from condition 2 is tapped on the surface of the lab bench an additional
47 times. The fill volume of the cylinder recorded is 38 ml.

a. Calculate the bulk density of the powder, DB, the porosity (pore volume per unit mass), P,
and the % voidage for a powder sample under the following three packing conditions. The
ppowder has a true density of 1.15 g/cm³.
1. Condition 1 (loose packing): a 35 gram sample of the powder is poured into a
100 ml graduated cylinder (to fill the cylinder).
2. Condition 2 (moderate packing): a 35 gram sample of the powder is poured into
a 100 ml graduated cylinder (to fill the cylinder). The cylinder containing the
loosely packed powder is tapped on the surface of the lab bench 3 times. The
fill volume of the cylinder recorded is 45 ml i.e. the packed powder goes up to
the 45ml line of the graduated cylinder.
3. Condition 3 (close packing): the cylinder containing the moderately packed
ppowder from condition 2 is tapped on the surface of the lab bench an additional
47 times. The fill volume of the cylinder recorded is 38 ml.

Added by Stacey T.

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