All of it, whatever it is, is stuff.
You weigh it.
density
The components of a solution are the SOLUTE and the SOLVENT. The SOLUTE is the substance that is dissolved. The SOLVENT is the dissolving liquid.
Salts, enzymes (lysozyme), water, possibly some mucus, maybe more stuff
Because density is a "ratio".
density
Density
You weigh it.
Density
Density
You weigh it.
density
stuff
this substance was used to stuff the nostrils
Beeswax
The substance was bee's wax.
The amount [of stuff] in an object or substance is its mass.