To measure the density of a material, particularly powders, the use of a helium gas pycnometer is essential for accurate results. Traditional methods like water displacement are inadequate due to potential interactions between the liquid and the sample. For bulk density measurements, weighing the container with and without the material provides a straightforward calculation. Density is defined as mass divided by volume, and using inert gases like helium minimizes measurement errors associated with irregularly shaped samples.
PREREQUISITESThis discussion is beneficial for materials scientists, laboratory technicians, and anyone involved in the measurement and analysis of material densities, particularly in powder form.
To determine the true density of solid powder particles, one therefore generally uses a helium gas pycnometer.epenguin said:Your liquid needs to be one that has no interaction with the solid, i.e. does not adsorb it nor dissolve in it. You don't want the solid floating on the liquid either.
Helium? Not heavy inert gases; small/fixed volumes times low densities equal small masses?Lord Jestocost said:uses a helium gas pycnometer.
Easier if you can just accept Bulk Density. Weigh the volume measurement container with and without your material. Note the volume measurement. Density, or in such a case, bulk density, is mass (which in your case might need to be "weight") divided by volume.EL AALLAOUI Najla said:yes I have a powder . thank you
"The problem with volume measurement is that object or substance isn't usually in a form of a regular shape but as a deformerd object or as a powder. Using classical method such as water diplacement isn't usually good enough since water could interact and become stuck on the sample surface. Gas pycnometry solves this by utilizing an inert gas and Boyle's gas law."Bystander said:Helium? Not heavy inert gases; small/fixed volumes times low densities equal small masses?