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Video Transcript for Bulk Density:
The sensitivity of powders to a reduction in a volume known as their compressibility, and the ability to combine as a single mass or the ability to consolidate or sinter due to pressure, can be investigated using bulk density methods.
These methods generally involve compressing a known mass of powder across a range of normal or consolidating stresses and observing the change in volume.
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Powder rheology and flow testing methods can provide a range of insights into predicting whether a powder will cake, flow, crumble, bridge/arch or rathole. While simple test methods such as angle of repose can provide a quick measurement, they lack significant detail and sensitivity to fully describe how a powder will behave in different scenarios.
Temperature, humidity, applied external stresses, static charge, particle geometry and physical dimensions can all play a role in the final observed bulk powder handling behaviour, sometimes with unexpected results.
