Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

1															2				3
			4
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	8														9					10
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		12
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		21		22																		23
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25
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 Check 

Across: 2. The unit of force named after Sir Isaac 5. Polymer that softens with heat 7. Mass per unit volume - kg/m3 8. How well electricity flows through 11. How well heat flows through 12. The ability to withstand wear and tear through weathering and corrosive attack 16. A test which pushes a ball bearing into the material 18. How well the flow of electricity is resisted 22. Sqeeze 24. Polymers which will not melt 25. Measured in ohms 26. A material that absorbs impact is ------ 27. Does not conduct electricity 28. The unit of mass

Down: 1. The unit of length 3. The unit of resistance 4. The crystalline structure of metals 6. Porcelain, stoneware and china are all --------- 9. A test which pushes a cone into the material 10. Steel, gold, copper and aluminium are all ------- 13. A material which lets electricity or heat to flow through is a ---------- 14. A measure of how easily a material can be scratched or indented. 15. Defects in the grain structure 17. To hit or collide 19. Plastics are ------------------ 20. Heating a metal to allow recrystallisation and softening. 21. Use the word polymer instead. 23. A test which pushes a pyramid into the material