ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Alkane molecules. Molecular models of three types of alkane (paraffin) molecule. They are, from left: butane (C4H10), isobutane (2-methylpropane, C4H10) and 2,2-dimethylpropane (C5H12). Carbon atoms are black and hydrogen atoms are white. Butane and isobutane both occur in natural gas and are produced during the cracking of petroleum. Both are used in refrigeration. Butane is also used for cooking and heating, for example in camping gas bottles.
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