AQA A LEVEL DT Key Terms Questions & Correct Answers/ Graded A+

Air Seasoning : A traditional, inexpensive method which involves stacking the wood under a shelter, protected from the rain. Air circulates between the planks to slowly remove the excess moisture. Kiln Seasoning : A more expensive but controlled method which is very quick and can take just a few weeks. Planks are stacked onto trolleys and placed in the kiln where both temperature and humidity are controlled. Hard wood : The wood from broad-leaved, mostly deciduous trees Rough sawn : Wood that comes directly from seasoning and has rough surfaces produced from initial conversion. Rough sawn wood will have normal sizes rather than accurate finished sizes Softwood : Wood from a cone-bearing tree (conifer) 2 Safe Working Temperature (Polymers) : The temperature deemed safe for processing without possible degradation of the polymer properties Composite : A material comprised of two or more different materials, resulting in a material with enhanced properties. Smart Materials : Materials whose physical properties change in response to an input or change in the environment, such as electricity, pressure, temperature or light. Modernism : A period, principally in the aftermath of the First World War, when elaborately decorated design was rejected in favour of functionality : Planned square edge (PSE) 3 : wood has only one edge that is planned accurately, the rest are rough sawn. PSE is about 3 mm smaller in width from the original nominal size Planned all round (PAR) : wood has sides and edges that are planed square, straight and level, leaving a smooth finish, and is ready to use. The PAR board is about 3 mm smaller all round than the original rough sawn nominal size Manufactured board : a man-made, wood-based composite material Stock form : the set of standard sizes in which materials are available, as well as the format e.g powders, granules, sheets etc. Mechanical properties : associated with how a material reacts to an external force Physical properties : associated with the actual make-up or structure of the materia