As nouns the difference between adhesiveness and adhesivity
is that adhesiveness is the quality of being, or the degree to which a thing is, adhesive while adhesivity is (uncountable) the condition of being adhesive.
adhesiveness
English
Noun
(-)
the quality of being, or the degree to which a thing is, adhesive
adhesivity
English
Noun
(uncountable) The condition of being adhesive
(countable) A measure of adhesiveness