Is Turning Flesh to Stone a Good Way to Get Smaller?

[@DoctorHoovy]

“A petrified creature is transformed, along with any nonmagical object it is wearing or carrying, into a solid inanimate substance (usually stone). Its weight increases by a factor of ten, and it ceases aging” page 291 of the PHB. So yes your density does increase

[@lukefranklin5]

Idk why OP assumes that the mass has to stay the same