Use a simple balance to determine the mass of each object, so they can see that even though one object is larger than another, the larger object may still be lighter (and thus less dense) than the smaller one.
(they; can see; that even though one object is larger than another, the larger object may still be lighter (and thus less dense) than the smaller one) Context(they can see,List([62, 74))):(the larger object; may be; lighter (and thus less dense) than the smaller one; T:still)
they can see,List([62, 74))
they the larger object
can see may be
that even though one object is larger than another, the larger object may still be lighter (and thus less dense) than the smaller one
lighter (and thus less dense) than the smaller one T:still