An example of an analogy drawing on a scientific concept (for an audience expected to already be familiar with the science):
" …one analogy for thinking about working memory – as being (in one sense) like a triglyceride molecule. Fats and oils are based on the same glycerol stem which has 'slots' for three fatty acid side chains – but these slots can be occupied by a wide range of different fatty acids so that the molecular mass of the resulting triglyceride can vary considerably depending on how extensive the linked fatty acid chains are. This is a bit like how an expert with the 'same' working memory limitations as a novice is able to hold much more information in mind at once because it is compounded into a small number of complex conceptual 'chains'. (Well, conceptual nets might be a better metaphor – but discrete units of higher 'informational mass', anyway.)"
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This analogy is discussed further here: How fat is your memory?
