Physics

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Across
  1. 3. electron
  2. 4. kelvin
  3. 6. atom
  4. 7. vector
  5. 10. scalar
  6. 11. gravity
  7. 12. molecule
  8. 14. Isotope
Down
  1. 1. proton
  2. 2. velocity
  3. 4. kilogram
  4. 5. mass
  5. 8. calorie
  6. 9. friction
  7. 13. liter