hard coal

/'hɑ:d'koul/

Thân thiện

A miner holds a piece of hard coal in his gloved hand.

Definition

1. 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.

Học thuật

Noun

1. a hard natural coal that burns slowly and gives intense heat

Từ đồng nghĩa

• anthracite
• anthracite coal