Search

...central wavelength of the spectral line. Why would the atoms be in motion? An obvious reason is that they are 'hot'. Atoms in a hot gas, for example, will be moving randomly with a range of speeds related to the temperature of the gas. For a gas of atoms of mass m at a temperature T, the velocity dispersion is given by where k is the Boltzmann constant (1.38 × 10−23 J...

...central position and to place related components close together. It also makes sense to show important sub-systems at a reasonable size and less important ones somewhat smaller, as this is the way relative size is likely to be interpreted by others. Use overlaps sparingly. Overlap only when the sharing of components is important. Multiple overlaps should be avoided. It is...