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Real-world implications::Units of measurement

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Units::physical    Mathrm::units    Quantity::times    Value::example    Measures::system    Systems::system

Real-world implications One example of the importance of agreed units is the failure of the NASA Mars Climate Orbiter, which was accidentally destroyed on a mission to Mars in September 1999 instead of entering orbit due to miscommunications about the value of forces: different computer programs used different units of measurement (newton versus pound force). Considerable amounts of effort, time, and money were wasted.<ref name=mixups> {{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref> {{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

On 15 April 1999, Korean Air cargo flight 6316 from Shanghai to Seoul was lost due to the crew confusing tower instructions (in metres) and altimeter readings (in feet). Three crew and five people on the ground were killed. Thirty-seven were injured.<ref> {{#invoke:citation/CS1|citation |CitationClass=pressrelease |type=Press release }}</ref><ref> {{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In 1983, a Boeing 767 (which came to be known as the Gimli Glider) ran out of fuel in mid-flight because of two mistakes in figuring the fuel supply of Air Canada's first aircraft to use metric measurements.<ref> {{#invoke:citation/CS1|citation |CitationClass=news }}</ref> This accident was the result of both confusion due to the simultaneous use of metric and Imperial measures and confusion of mass and volume measures.


Units of measurement sections
Intro  History  Systems of units  Base and derived units  Calculations with units of measurement  Real-world implications  See also  Notes  External links  

Real-world implications
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