An example of quotidian comparisons used to explain science:
"The interstellar gas is certainly extremely rarefied. On average over the whole galaxy a large matchbox full of it would contain only about a hundred atoms. This my be compared with the material in a star, like the Sun, where on average a matchbox full would contain about a hundred million million million million atoms."
Fred Hoyle (1960) The Nature of the Universe (Revised ed.)
Read about quotidian comparisons
A document listing a wide range of examples of science analogies, similes, metaphors and other comparisons, drawn from diverse sources, can be downloaded using this link: 'Creative Comparisons: Making Science Familiar through Language. An illustrative catalogue of figurative comparisons and analogies for science concepts.'