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Different hydrocarbons have different boiling points (and melting points) depending on their molecular size: smaller molecules boil at lower temperatures, larger molecules boil at higher temperatures. This fact is used to refine petroleum by fractional distillation.

Methane has very small molecules and is a gas. Gasoline, diesel fuel, and kerosene have medium size molecules and are liquids. Asphalt has large molecules and is solid.

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Sigurd Nolan

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3y ago

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