Answer:
Something that has a higher density will have more mass packed into it while something that has a lower density will have less mass.
think of comparing a pebble to a piece of popcorn. the pebble is more dense because it has more mass in the space it takes up than the popcorn.
hollowness : how much empty space there is inside a thing
Step-by-step explanation:
even if something is big it can
fly or float
if there is a lot of empty space inside
which means a plane or boat have lower density
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