If the density changes, the dielectric constant changes!

The dielectric constant differs depending on the material. It depends on the state of the substance too.

For example density !

The dielectric constant of powdered objects is smaller than that of object if was solid.
The dielectric constant of PVC is 5.8 to 6.4, but when turned into powder it is 1.3 to 1.5.
The dielectric constant of air-transported powder material is smaller,
because air（Dielectric constant:1.000586）is mixed with the powder.

This product can detect changes in powder density in real time by measuring the capacitance of that.