Units

What nautical mile is? A nautical mile is a unit of length used in marine navigation and maritime law. It is based on the circumference of the Earth, which measures just over 21,000 nautical miles around the Equator. The mile nautical is approximately equal to 1 minute of arc of...

One nautical mile 1 nautical mi is a unit of measurement used in both marines navigation and aviation. It is equal to 1.852 kilometers or approximately 1.151 mi. The nautical mi is used to measure latitude and longitude coordinates, as well as speed in knots (mi/hour). Speed measurement in knots...

Non- SI unit of length Mile is non-SI unit which means that mile is non-system unit of measurement. This term is also used to denote factors that do not belong to any system of units of measurement, or that do not belong to the considered system of measurement. The SI...

US size shoes may have different EU equivalents. As a rule, a US size shoe is 1 size smaller for women than for men. In general, size conversion can be done in a linear fashion using the general formula for converting US size to EU size. However, this method of conversion is unreliable...

Kilogram definition In September 1889 when the General Conference of Measures took place, the kilogram standard was established. The standard kilogram (symbol kg) is a cylinder with a height and base diameter of 39 mm and it's made of an alloy of platinum (90%) with iridium (10%). That prototype is...

The avoirdupois system The avoirdupois system (abbreviation for the avoirdupois system is avdp.) is a measurement system of weights that uses pounds and ounces as units. It is used in United Kingdom, Canada, New Zealand, Australia, and some other former British colonies, despite their official adoption of the metric system....

Stones and pounds The stone or stone weight (abbreviation for stone is st.) is an English and imperial unit of mass equal to 14 pounds (approximately 6.35 kg). We have to differentiate one pound for weight calculation from money value also called pound. For weight pounds we use abbreviation is written as...

Imperial and metric measurement system In the past units were derived from the dimensions of the human body. For example, inch was the width of human thumb. A yard was invented by merchants for measuring linen. One yard was the length of the cloth stretched between the chin and the...

British imperial units vs metric system A measurement system used in the United Kingdom and former British colonies is called imperial units. The system of weights and measures came to United States from the Great Britain with the first settlers. Despite the fact that in the 20th century, a much...

How many cm When we want to check how many centimeters does certain value contain we have to convert certain unit to centimeters. There are online converters that can be used for that purpose, however it's good to know some basic rules and to be able to apply conversion logic...