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Across 6. An object being worked on with a tool or machine 9. This refers to how hot or cold something is 10. A strong, lightweight, corrosion-resistant silvery-grey metal 12. A material or object that allows some electricity or heat to move through it and that is used especially in electronic devices 14. Another word for device 16. Designed to stick to something 19. The mechanism by which power is transmitted from an engine to the axle in a motor vehicle 21. A surface chemical reaction that occurs, especially on metals, by the action of moisture, air or chemicals 23. A machine used to supply air or other gas at increased pressure 26. The action of one surface or object rubbing against another 28. Heating and then slowly cooling metal, glass etc. in order to make it stronger 30. Hard but liable to break or shatter easily 31. A device for controlling the level or amount of something, e.g. speed or temperature 34. The machining process of using rotary cutters to remove material from a workpiece 35. A flow of electricity 36. A metal made by combining two or more metallic elements 37. Refers to what comes out of a car´s tailpipe 38. A piece of curved or bent metal that can be pressed into a smaller space but then returns to its usual shape 39. A device that detects heat, light, sound, motion etc. 40. Exerting a powerful attraction

Down 1. The amount by which something becomes smaller 2. The act or process of moving faster or happening more quickly 3. Substance which harms the environment 4. To move or cause to move backwards 5. The capabilities of a machine or product 7. The cracking or breaking of a hard object or material 8. A process which cools a closed space by removing heat from it 11. Make something on a large scale using machinery 13. The act or process of shaping by forcing a material through a die 15. A unit used to measure the power of engines 17. Releasing a gas or vapour into the atmosphere 18. To treat or process (used or waste materials) so as to make suitable for reuse 20. The area of science concerned with the properties, production, and purification of metals 22. Weakness in metals or other materials caused by repeated variations of stress 24. A device fitted to something to give more support 25. An empty space 27. A support, guide, or locating piece for a rotating or reciprocating mechanical part 29. An electromotive force expressed in volts 32. A substance added to improve or preserve something 33. A thick oily substance, especially used as a lubricant