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propylene
Propylene is a technical term used almost exclusively within the fields of organic chemistry and industrial manufacturing. It carries a neutral, scientific connotation and is rarely encountered in general conversation unless discussing plastics or chemical engineering.
As a chemical substance, it is treated as an uncountable mass noun. It refers to the gas itself as a bulk material rather than individual molecules, meaning it does not have a plural form in standard usage.
Meanings
A colorless, flammable gaseous hydrocarbon with the formula C3H6, used primarily in the production of polypropylene plastic.
The industrial plant produces thousands of tons of propylene per year.