Measurement and units

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Across
  1. 3. Term used to refer 'a very high speed'
  2. 4. Smallest value that can be measured using an instrument
  3. 8. Internationally accepted unit for length, symbol 'm'
  4. 10. Quantity expressed by a number followed by its unit
  5. 13. Quantities expressed in terms of fundamental quantities
  6. 14. Plastic bags below what microns are prohibited to sell in shops
  7. 15. SI unit of temperature
  8. 16. Fundamental quantity used to find area and volume
  9. 18. Abbreviation of micrometre
  10. 19. Amount of matter contained in a substance
Down
  1. 1. Amount of space and object occupies
  2. 2. Length represents the _ between two points
  3. 5. SI unit of luminous intensity
  4. 6. Mass per unit volume of a substance
  5. 7. SI unit of current
  6. 9. quantities that exist independently and cannot be expressed in terms of other quantities
  7. 11. The distance light travels in a year in vaccum
  8. 12. Standardized reference accepted universally to measure physical quantity
  9. 17. Unit of mass, symbol 'kg'
  10. 20. SI unit of time