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High School Entrance Examination Physics~Experts are here to help

Actually, I really want to answer it, but I can’t express it clearly

Can I search it myself or read a book?

A hot air balloon changes the density of the air inside the ball

An airship is filled with gas that has an average density lower than the air

A submarine has a water tank and the displacement boat rises The submerged boat sank

I'm not an expert, but that's what I mean anyway...

Let's figure it out for ourselves...