- Colloidal fuel
- USS Gem
- Emulsified fuel
- Sulfur
- Monopropellant
- Quantum dot
- Emulsion
- Catalytic converter
- Sol–gel process
- Coacervate
colloidal fuel
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Colloidal fuel is an emulsion of powdered coal in kerosene or fuel oil. It was used in World War I aboard ships as kerosene supplies ran low.
Development continued after the war, and in 1932 the Cunard liner Scythia made a round-trip transatlantic voyage partly powered by colloidal fuel containing 40% coal. Advantages over oil included cost and energy density. Colloidal fuel is denser than water, which allows it to be stored under water.