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I suspect that what you are actually looking for is the following: - 1 gram of fat = 9 kcal - 1 gram of protein = 4 kcal - 1 gram of sugar = 4 kcal - 1 gram of alcohol = 7 kcal Those are general and inexact values. They're just often used to give a rough idea of the amount of energy we get from different types of food.


This is a classic Fermi estimation problem. The usual approach is to estimate the volume of a body, estimate the volume of a cell, and divide one by the other, remembering of course to have both volumes in the same units. My quick attempt gave 1013 to the nearest order of magnitude.


Find, or calculate, a value for the volume of the sperm head. Find a value for the size of the human genome (haploid or diploid?) Convert the genome size, which will probably in Giga basepairs, into mass (I suggest picograms). Divide mass by volume to get a density, pg μm-3 Refinement - does the sperm nucleus take up all of the head volume? Do you ...

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