PM has various meanings in the Energy category. Discover the full forms, definitions, and usage contexts of PM in Energy.
Particles formed by incomplete combustion of fuel. Compression ignition (diesel) engines generate significantly higher PM emissions than spark ignited engines. The particles are composed of elemental carbon, heavy hydrocarbons (SOF), and hydrated sulfuric acid.
EnergyA situation where a device will turn forever because there is no friction between the moving part and the stationary part. Although friction can be greatly reduced, it can never be eliminated. Thus a perpetual motion machine is impossible.
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