Density crossword puzzle

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Across
  1. 2. The force that helps things float in water or other liquids
  2. 6. something
  3. 7. Spreads out and fills the space
  4. 8. A unit of mass used to measure how much stuff is in something.
  5. 10. How packed stuff is inside an object
  6. 12. A unit that measures volume.
Down
  1. 1. How much space something takes up or holds
  2. 3. How heavy something feels
  3. 4. The amount of stuff inside an object
  4. 5. Something that keeps its shape
  5. 9. Anything that takes up space and has stuff inside it
  6. 11. Takes the shape of its container