LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Molecular model of the hydrocarbon n- octane (formula: C8H18). The atoms are spherical and colour-coded: carbon (blue) and hydrogen (white). The n refers to the straight chain form, in which all the carbons are arranged in an unbranched line, as seen here. It is one member of a family of 18 octanes, all of which have the formula C8H18. The "octane number" of a fuel is a measure of how efficient it is compared to a standard. The higher the number, the more efficient the fuel.
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