Units and measurement

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Across
  1. 6. unit of solid angle
  2. 7. SI unit of measure of degree of hotness
  3. 8. equivalent to one joule per second
  4. 9. unit of product of mass and acceleration
  5. 10. base quantity whose unit is same in all systems
  6. 12. independent of other physical quantities
  7. 13. unit of rate of flow of charge
  8. 15. gram per centimetre cube is unit of
Down
  1. 1. expressed in terms of other quantities
  2. 2. can be measured directly or indirectly
  3. 3. weakest force in nature
  4. 4. strongest forces in nature
  5. 5. ratio of arc length to radius
  6. 11. unit of energy
  7. 14. unit of pressure