Materials, Inventions, Units

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Across
  1. 5. – Invention that illuminated the modern world
  2. 6. – Permissible limit of variation in a physical dimension
  3. 7. – SI unit of force
  4. 9. – Alexander Graham Bell’s 1876 invention
  5. 10. – Rotational force measured in newton-metres
Down
  1. 1. – High-performance thermoplastic used in engineering and medicine
  2. 2. – Synthetic polymer invented in 1935
  3. 3. – Drove the Industrial Revolution
  4. 4. – Corrosion-resistant alloy used in cutlery and skyscrapers
  5. 8. – Lightweight metal used in aircraft and packaging