Matter

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Across
  1. 2. the degree of compactness of a substance.
  2. 5. Basic unit of matter
  3. 6. A small particle in the nucleus of the atom, with no electrical charge
Down
  1. 1. used to measure the volume of a liquid
  2. 3. Amount of space occupied by an object
  3. 4. a lipped cylindrical glass container for laboratory use.