hải lí

Tàu di chuyển với tốc độ 20 hải lí mỗi giờ.

Definition

1. Noun:
   • Nautical mile: A unit of measurement used in maritime and aviation navigation, equal to exactly 1,852 meters. It is based on the circumference of the Earth and is used to measure distances at sea.

Usage Examples

• Noun:
  • Tàu di chuyển với tốc độ 20 hải lí mỗi giờ. (The ship is moving at a speed of 20 knots.)
  • Khoảng cách giữa hai cảng là 120 hải lí. (The distance between the two ports is 120 nautical miles.)

Advanced Usage

• "tốc độ ... hải lí một giờ": This phrase is used to express speed in knots, where one knot equals one nautical mile per hour.
  • Tàu ngầm lặn với tốc độ 5 hải lí một giờ. (The submarine dives at a speed of 5 knots.)

Variants and Related Words

• Dặm biển: This is a less common synonym for "hải lí" in Vietnamese, also meaning "nautical mile."
• Hải lý: An alternative, commonly accepted spelling for "hải lí."
• Knot (nút): The unit of speed equal to one nautical mile per hour. While "knot" is a unit of speed and "hải lí" is a unit of distance, they are directly related in navigation contexts.

Synonyms

• Nautical mile: The direct English equivalent.
• Sea mile: A less common English term with the same meaning.

Related Phrases

• Tốc độ hải lí: Nautical speed (speed measured in knots).
  • Đồng hồ đo tốc độ hải lí bị hỏng. (The knotmeter is broken.)
• Bản đồ hải lí: Nautical chart.
  • Thuyền trưởng đang xem xét bản đồ hải lí. (The captain is examining the nautical chart.)

Notes on Usage

• The word "hải lí" is a compound noun formed from "hải" (sea) and "lí" (a unit of distance, from the Chinese 里). It is used exclusively as a measurement unit in maritime and aerial contexts.
• In scientific and international contexts, the abbreviation "M" or "NM" (for Nautical Mile) is often used, but in Vietnamese, the full term "hải lí" is standard.
• Do not confuse with "dặm" (statute mile), which is a land-based unit equal to approximately 1,609 meters.