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...simple. Imagine a giant grid extending over the whole of space. Figure 6 shows the two-dimensional case, with a grid extending over part of the page. The grid is calibrated (in centimetres) so the position of any point can be specified by giving its x- and y-coordinates on the grid. For example, the coordinates of point A are x = 3 cm and y = 4 cm. [Figure 6] Figure 6 A...

...simple plane of identical atoms – fully three-dimensional networks are more realistic but less easy to draw. [Figure 4] Figure 4 Atoms in a solid can be represented as spheres, arranged in planes as a component of some three-dimensional configuration What happens if we try to force the atoms closer together, say by compressing the solid, squeezing it uniformly from all...

...device communication: 1.4 Communicating devices - We would like you now to think about a simple IT process you are already familiar with – the process that starts when you click the Print icon on your computer's word-processor screen. For now, imagine that there is simply a point-to-point connection between your computer and the printer (as indeed there may well be) and that the printer is not being shared with other ......