quasivacuum

As nouns the difference between baryon and quasivacuum

is that baryon is baryon while quasivacuum is (physics) any state that approximates to a vacuum, especially one free of baryons.

As nouns the difference between vacuum and quasivacuum

is that vacuum is (rare|chiefly|netherlands) while quasivacuum is (physics) any state that approximates to a vacuum, especially one free of baryons.