heavy oil; fuel oil
Refers to heavy petroleum fractions used as industrial fuel, such as in boilers and ships. Not used for light oils like gasoline or kerosene.
This factory uses heavy oil as fuel for its boilers.
When the price of fuel oil rises, the cost of power generation also increases.
This ship runs on heavy oil as fuel.
Heavy oil spilled into the sea after the tanker accident.
The factory boiler burns heavy oil to produce steam.
原油 is unrefined crude oil straight from the ground, while 重油 is a specific heavy fraction obtained after refining crude oil.
Standard kanji spelling for heavy fuel oil.
Compound of 重 (heavy) and 油 (oil), directly describing its physical property as a heavy petroleum product.