Tapped density là gì

Bulk và true are different. Bulk including the pores within particles whereas true excludes the same. Hence bulk density is smaller than true one


http://www.who.int/medicines/publications/pharmacopoeia/Bulk-tapped-densityQAS11_450FINAL_MODIFIEDMarch2012.pdf
http://www.usp.org/sites/default/files/usp_pdf/EN/USPNF/revisions/m99375-bulk_density_and_tapped_density_of_powders.pdf
https://www.ecn.nl/docs/society/horizontal/CEN-Determination%20of%20bulk%20mật độ trùng lặp từ khóa,%20Version%20240805.pdf

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True density is constant value for a matter. True density is the mật độ trùng lặp từ khóa of the solid material. As a geologist, calcite mineral has true mật độ trùng lặp từ khóa of 2.72 gr/cm3. 
Apparent mật độ trùng lặp từ khóa is similar khổng lồ the true density except the volume of closed pores is also included so it is less than true mật độ trùng lặp từ khóa. for example a crabonate rock which is composited of pure calcite, show apparent density less than 2.72 gr/cm3
Bulk Density: Bulk mật độ trùng lặp từ khóa is a characteristic of a volume of divided material such as powders, grains, và granules. It includes the volume of the solid material, open và closed pores, và the interparticle void. so its less than Apparent density for same sample.

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Envelope Density: Like bulk density, envelope density is determined from the volume of the solid material, open pores, và closed pores. Envelope mật độ trùng lặp từ khóa is determined for a single, consolidate quantity of material, therefore there are no interparticle voids between packed particles.

The following discussion addresses both bulk density and apparent density: https://www.tienhieptruyenky.com/post/what_is_the_difference_between_Bulk_density_and_Apparent_density
I have sầu discussed the determination of bulk mật độ trùng lặp từ khóa by the Archimedes method for porous samples elsewhere at this forum: https://www.tienhieptruyenky.com/post/How_do_i_calculate_for_percentage_porosity_in_a_ceramic_material/1
The bulk mật độ trùng lặp từ khóa of a powder is the ratio of the mass of an untapped powder sample và its volume including the contribution of the inter particulate void volume. Hence, the bulk mật độ trùng lặp từ khóa depends on both the density of powder particles và the spatial arrangement of particles in the powder bed. The bulk mật độ trùng lặp từ khóa is expressed in grams per millilitre (g/ml) although the international unit is kilogram per cubic metre (1 g/ml = 1000 kg/m3 ) because the measurements are made using cylinders.

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The bulk mật độ trùng lặp từ khóa of a powder is determined by measuring the volume of a known mass of powder sample, that may have been passed through a sieve, inlớn a graduated cylinder (Method A), or by measuring the mass of a known volume of powder that has been passed through a volumeter into a cup (Method B) or a measuring vessel (Method C).
volume determined by the use of graduated cylinder, the cylinder can be tapped giving a measure of the so called Tapped Density.

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The tapped density is an increased bulk density attained after mechanically tapping a container containing the powder sample. The tapped mật độ trùng lặp từ khóa is obtained by mechanically tapping a graduated measuring cylinder or vessel containing the powder sample. After observing the initial powder volume or mass, the measuring cylinder or vessel is mechanically tapped, & volume or mass readings are taken until little further volume or mass change is observed. The mechanical tapping is achieved by raising the cylinder or vessel và allowing it khổng lồ drop, under its own mass, a specified distance by either of three methods as described below. Devices that rotate the cylinder or vessel during tapping may be preferred to minimize any possible separation of the mass during tapping down.
True density: The mass of a particle divided by its volume, excluding open và closed pores. as true/skeletal volume for true density measurement- includes volume of solid phase only và any closed pores within that are not open khổng lồ the outside surface. For regular shapes this is easy khổng lồ measure using an accurate balance and a ruler, for irregular or fractured shapes we employ the Archimedean principle of fluid/gas displacement to lớn measure the volume. The gas pycnometry operating principle is Gas Law: PV = nRT Where P is the gas pressure, V is the volume containing the gas, n is the number of moles of the gas, R is the universal gas constant và T is the temperature of the gas. Introducing a sample into an analysis chamber of a known volume we determine the volume of a gas displaced by the sample và true volume of the analysed material. Mo