当前位置: 首页 > 知识库

What Is A Knot, And How Many Knots Are In A Mile?

来源:四库百科 时间 : 2021-05-08 12:18:49 属于:Did You Know
Definition

A nautical mile is defined as a unit of length based on the earth’s circumference that is equal to a single minute of latitude. A nautical mile is not a statute mile (a mile measured over land.) Nautical miles are most commonly used in navigating and charting, especially over water. Compared to the statute mile, a nautical mile is slightly larger. Previously, there was no internationally defined and recognized conversion between a nautical mile and a statute mile. During that time, the UK and the US used different definitions. However, since the 20th century, one nautical mile is internationally defined as equal to 1.1508 statute miles. Compared to meters, one internationally defined nautical mile is equal to 1,852 meters.

A knot is a unit of speed based on the nautical mile. One knot is the same as one nautical mile per hour. Therefore, one knot is equal to 1.1508 statute miles per hour (1.1508 mph). The internationally recognized symbol for the knot by the ISO and the Institute of Electrical and Electronics Engineers is kn. Some people use another common symbol of the knot which is denoted as kt. The knot is most commonly used in maritime and air navigation as well as in meteorology. A liner at sea travelling at a speed of 1 kn along a path marked by a meridian is said to be travelling at least a minute of geographic latitude in an hour.

What Is The Origin Of Knots?

The term “knots” has a maritime origin. In times past, sailors did not have the modern technologies for navigation and measuring speed while at sea. Instead, they used a simple tool called a common log in order to approximate the speed of vessels at sea. The common log was simply a coil of rope with knots tied at uniformly spaced distances. The rope was then joined to a piece of wood with the shape of a slice of pie. The wooden end was then dropped into the sea so that it could float. The rest of the coil unrolled gradually as the ship sailed. The coil was allowed to unroll for a specific amount of time which was determined by an hourglass. After the specified time was exhausted, the rope was reeled back into the ship. Sailors would then tally the number of knots between the piece of wood and the ship. The speed of the ship was the number of knots counted. Based on the current knowledge of a knot, it is safe to conclude that the distance of intervals between the knots was close to one nautical mile. The reason for this conclusion is that, by then, the nautical mile had not been internationally defined and accepted.

Most professionals do not use knots among non-professionals because it is not a widely understood unit. Instead, professionals would usually convert the measurements.

Conversion To Other Units

One knot (as defined internationally and accepted) =:

  • Exactly 1.852 kilometers per hour.
  • Approximately 0.51444 meters per second.
  • Approximately 20.25372 inches per second.
  • Approximately 1.68781 feet per second.
热门推荐
  • 生活常识
  • 家务日常
  • 习俗礼仪
  • 舌尖美食
  • 经典国学
最新发布
粘钩背胶怎么去除
粘钩背胶怎么去除
粘钩背胶可以使用指甲水去除,将指甲水涂抹在粘钩背胶处,等待5分钟时间,使用抹布擦拭干净,或者将吹风机开至热风,对准粘钩背胶吹
生韭菜可以生吃吗
生韭菜可以生吃吗
生韭菜可以生吃,但在食用前,要将韭菜上的腐烂叶剔除,并将其清洗干净,以免残留有农药等杂质,影响健康,食用韭菜的过程中,不要吃大
华年不能结婚是什么意思
华年不能结婚是什么意思
华年不能结婚是一种陈旧的婚嫁习俗,人们认为立春是新年的开始,但华年的立春在新年之前,给人一种残缺、不完整的感觉,因此不希
西柚是什么
西柚是什么
西柚是一种水果,属于柚子的一种,果肉为淡红色,主要产地为中国台湾、以色列、南非等地区,西柚应该放置通风阴凉处保存,因为外皮
极免是哪个快递公司的
极免是哪个快递公司的
极免是上海极兔速递有限公司,成立于2015年8月成立,是东南亚首家的科技型快递公司,极免速递业务涉及范围广泛,在快运、快递、供
大兴机场面积多大
大兴机场面积多大
大兴机场面积为150平方公里,其中建筑面积为70万平方米,包括航站楼、候机室、主楼、指廊等多个区域,其中还有5万多平方米的商
酒精是溶液吗
酒精是溶液吗
酒精是溶液,是一种无色透明、易燃烧的液体,主要成分为乙醇,不同的酒精度数在用途上也不同,25%到50%浓度的酒精一般多用于物理
洗发水能带上飞机吗
洗发水能带上飞机吗
洗发水能带上飞机,但携带容量要在一百毫升以内,超过一百毫升要办理托运手续,不能随身携带,而且每位乘客只能免费托运20到40公
口蘑不能和什么一起吃
口蘑不能和什么一起吃
口蘑不能和味精一起吃,和味精一起吃时,口蘑的口感会变差。也不能和番茄一起吃,和番茄一起吃时,口蘑会破坏让番茄的营养价值降
山药与白萝卜能一起吃吗
山药与白萝卜能一起吃吗
白萝卜和山药能一起吃,这两种食材的营养物质不会产生不良反应,对人体造成伤害,但食用不宜过多,以免影响消化,挑选山药时,要选择