matter

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Across
  1. 4. The state of matter with a definite shape and volume.
  2. 6. The smallest unit of matter.
Down
  1. 1. The state of matter that flows and has a definite volume but no fixed shape.
  2. 2. The state of matter that has neither fixed shape nor fixed volume.
  3. 3. A substance made of only one kind of particle.
  4. 5. The process where a liquid changes into gas.