Examlex
The dust in the interstellar medium comes primarily from stellar winds of main-sequence stars.
Propane
A flammable hydrocarbon gas used as a fuel for heating, cooking, and in some vehicles, also known as liquefied petroleum gas (LPG) when stored under pressure.
Natural Gas
A combustible hydrocarbon mainly made up of methane, utilized for generating heat, cooking food, and producing electricity.
Net Useful Energy Yield
The difference between the energy produced by a system and the energy consumed to create that energy, indicating the efficiency of energy production.
Oil Shale
A sedimentary rock containing organic materials that can be processed to produce shale oil.
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