hard coal
/'hɑ:d'koul/
Definition
- Noun:
- Anthracite: A hard, high-carbon variety of coal that burns with little smoke and gives intense heat. It is a natural, metamorphic coal with a brilliant, almost metallic luster.
Usage and Examples
- Noun:
- The region is known for its deposits of high-quality hard coal.
- For clean, efficient heating, many industries prefer to use hard coal.
Advanced Usage
- Technical/Geological Context: In geology and energy sectors, "hard coal" is a precise term for anthracite, distinguishing it from softer, lower-grade coals like bituminous or lignite.
- The power plant was retrofitted to utilize hard coal more efficiently.
Variants and Related Words
- Anthracite (n): A direct synonym for hard coal.
- Anthracite is the highest rank of coal.
- Bituminous coal (n): A softer, more common type of coal, distinct from hard coal.
- Steam coal (n): A grade of coal, often bituminous, used for steam generation, contrasted with hard coal used for heating.
Synonyms
- Anthracite: The most precise and common synonym.
- Stone coal: An older, less common term for anthracite.
Related Phrases
- Hard coal mining: The industry or process of extracting anthracite from the earth.
- The history of hard coal mining shaped the culture of the valley.
Noun
-
a hard natural coal that burns slowly and gives intense heat
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