Definition

1. Noun:
   • Pygeometer: An instrument used in meteorology and environmental science to measure the effective terrestrial radiation, or the net longwave radiation emitted by the Earth's surface into the atmosphere.

Usage Examples

• Noun:
  • Các nhà khoa học sử dụng địa xạ kế để nghiên cứu cân bằng bức xạ của Trái Đất. (Scientists use a pygeometer to study the Earth's radiation balance.)
  • Số liệu từ địa xạ kế rất quan trọng cho các mô hình khí hậu. (Data from the pygeometer is crucial for climate models.)

Advanced Usage

• The term is highly specialized and used almost exclusively in technical contexts within meteorology, climatology, and environmental physics. It is not used in everyday conversation.

Variants and Related Words

• Pyradiometer (n): A more general instrument for measuring both solar and terrestrial radiation.
• Net radiometer (n): An instrument that measures the difference between incoming and outgoing radiation (both solar and terrestrial).

Synonyms

• Terrestrial radiometer: An instrument for measuring Earth's radiation.
• Longwave radiation sensor: A descriptive term for its function.

Notes on Usage

• "Địa xạ kế" is a compound Sino-Vietnamese word: "địa" (earth), "xạ" (radiation), "kế" (meter). It is a precise technical term.
• In many modern English-language scientific texts, the specific function is often described rather than using the rare term "pygeometer." Phrases like "instrument for measuring terrestrial radiation" or "net longwave radiometer" are more common.