Convert miles to meters

マイル

定義
A mile (symbol: mi) is an Imperial and U.S. customary unit of length equal to exactly 5 280 feet, 1 760 yards, or 1 609.344 meters.

起源
ラテン語に由来する ミルパサス (“thousand paces”), the mile was standardized in England in 1593 as 8 furlongs (5 280 ft). Variants like the Roman mile (5 000 ft) and the nautical mile (1 852 m) persist in specialized contexts.

現代の使用
Miles remain the standard on highways and road signs in the U.S., U.K., Myanmar, and Liberia. They’re also used for aviation (statute vs. nautical miles) and in some sporting events.

メーター

定義
A meter (symbol: m) is the SI base unit of length, defined as the distance light travels in a vacuum in 1⁄299 792 458 of a second. This constant-based standard was adopted in 1983 and refined in 2019.

起源

1793: One ten-millionth of the Earth’s quadrant from Equator to North Pole
1889: Defined by a platinum–iridium prototype bar at 0 °C
1960: クリプトン-86の発光波長で再構成
1983-2019: Anchored to the fixed speed of light

現代の使用
Meters dominate science, engineering, construction, and everyday measurements worldwide. Though the U.S. often uses customary units, meters underpin its scientific and trade standards.