brown coal

/'braun'koul/

Thân thiện

A worker loads brown coal into a furnace at a power plant.

Definition

1. Noun:
   • A type of coal: "brown coal" is a soft, brownish-black sedimentary rock that is an intermediate stage between peat and bituminous coal in the coal formation process. It has a lower carbon content and heating value than higher-grade coals.

Usage Examples

• Noun:
  • The power plant was designed to run on locally mined brown coal.
  • Brown coal, also known as lignite, is a major source of energy in some regions.

Advanced Usage

• As a geological/energy resource term: Often discussed in contexts of energy production, geology, and environmental impact due to its higher moisture content and lower efficiency compared to harder coals.
  • The debate focused on the environmental cost of generating electricity from brown coal.

Variants and Related Words

• Lignite (n): A direct synonym for brown coal.
  • Lignite deposits are found in several parts of the country.

Synonyms

• Lignite: The more precise geological term for brown coal.

Related Phrases/Compounds

• Brown coal seam: Refers to a layer or deposit of brown coal in the earth.
  • The miners accessed a new brown coal seam.

Học thuật

Noun

1. intermediate between peat and bituminous coal

Từ đồng nghĩa

• lignite
• wood coal