# Bulk Density

Section summary
1. Definition
2. Calculation
3. Measurement
4. Application

## 1. Definition

The bulk density is the density of the bulk of the particles, included the voids in between each particles. 2 bulk densities are usually measured :
- Loose Density
- Tapped Density

## 2. Calculation

Equation 1 : Solids Bulk Density

## 3. Measurement

When measuring the loose density, the powder must be in its aerated state.

Figure 1 : Measuring loose bulk density

When measuring tapped density, a step of powder compaction is necessary.

Figure 2 : Measuring tapped bulk density

## 4. Application

Bulk density is used, among other purposes, to calculate the sizes of vessels in the process (hoppers, silos...)

Example
A weighing hopper must hold a maximum of 500 kg
The loose density of the powder dosed is 0.34 kg/l
The required useful volume of the hopper must be 500/0.34=1470 liters (be careful here to angle of repose of the powder to calculate the total volume of the hopper)

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