than nâu
Definition
- Noun:
- Lignite: A soft, brownish-black sedimentary rock with a woody texture, formed from naturally compressed peat. It is considered a low-rank coal due to its relatively low heat content and high moisture content compared to higher-grade coals like bituminous or anthracite.
Usage Examples
- Noun:
- Nhà máy điện này sử dụng than nâu làm nhiên liệu chính. (This power plant uses lignite as its primary fuel.)
- Than nâu có nhiệt lượng thấp hơn than đá. (Lignite has a lower calorific value than hard coal.)
- Các mỏ than nâu thường nằm ở độ sâu không lớn. (Lignite deposits are often located at shallow depths.)
Advanced Usage
- "Than nâu non": Brown coal, a term sometimes used interchangeably with lignite, particularly for very young deposits.
- Khu vực này có trữ lượng than nâu non lớn. (This area has large reserves of brown coal.)
Variants and Related Words
Than bùn (n): Peat, the organic material that precedes the formation of lignite.
- Than bùn là giai đoạn đầu tiên trong quá trình hình thành than. (Peat is the first stage in the coal formation process.)
Than đá (n): Coal, a general term that includes higher-grade coals like bituminous and anthracite.
- Than đá cứng hơn và cháy nóng hơn than nâu. (Hard coal is denser and burns hotter than lignite.)
Synonyms
- Brown coal: A common synonym for lignite.
- Low-rank coal: A technical term describing its position in the coalification series.
Related Concepts
- Fossil fuel: Lignite is classified as a fossil fuel.
- Sedimentary rock: Lignite is a type of organic sedimentary rock.
- Combustible: Capable of catching fire and burning, a key property of lignite.