Main

## Main.MathcadUnits History

May 29, 2014, at 03:07 PM by 10.8.116.165 -
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An often cited example of the importance of getting units correct in design calculations is the [[[[https://en.wikipedia.org/wiki/Mars_Climate_Orbiter | Mars Climate Orbiter]]. The orbiter got too close to the planet, causing it to pass through the upper atmosphere and disintegrate. The problem was that computer software produced an output in non-SI units of pound-seconds (lbf×s) instead of the metric units of newton-seconds (N×s) specified in the contract between NASA and Lockheed.
to:
An often cited example of the importance of getting units correct in design calculations is the [[https://en.wikipedia.org/wiki/Mars_Climate_Orbiter | Mars Climate Orbiter]]. The orbiter got too close to the planet, causing it to pass through the upper atmosphere and disintegrate. The problem was that computer software produced an output in non-SI units of pound-seconds (lbf×s) instead of the metric units of newton-seconds (N×s) specified in the contract between NASA and Lockheed.
May 29, 2014, at 02:36 PM by 107.188.175.164 -
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* [[Attach:Mathcad_units_solution.pdf | Mathcad Units Worksheet Solution (pdf)]]
May 29, 2014, at 02:31 PM by 107.188.175.164 -
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* [[Attach:mathcad_units.zip|Mathcad Units Worksheet (xmcd)
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* [[Attach:mathcad_units.zip | Mathcad Units Worksheet (xmcd)]]
May 29, 2014, at 02:31 PM by 107.188.175.164 -
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(:title Unit Conversions in Mathcad:)
(:keywords unit conversion, Mathcad, university course:)
(:description Unit Conversions in Mathcad - Problem-Solving Techniques for Chemical Engineers at Brigham Young University:)

An often cited example of the importance of getting units correct in design calculations is the [[[[https://en.wikipedia.org/wiki/Mars_Climate_Orbiter | Mars Climate Orbiter]]. The orbiter got too close to the planet, causing it to pass through the upper atmosphere and disintegrate. The problem was that computer software produced an output in non-SI units of pound-seconds (lbf×s) instead of the metric units of newton-seconds (N×s) specified in the contract between NASA and Lockheed.

In future missions problems with units have been addressed. Imagine attempting to perform a fully automated landing on Mars when the software is using miles instead of kilometers. How would this impact the final result?

(:html:)
<iframe width="560" height="315" src="//www.youtube.com/embed/Ki_Af_o9Q9s?rel=0" frameborder="0" allowfullscreen></iframe>
(:htmlend:)

Mathcad is a tool to arrange, calculate, and visualize engineering calculations and units can be a part of each number or equation. Use the following worksheet to step through example problems related to using units effectively in a Mathcad worksheet.

* [[Attach:mathcad_units.zip|Mathcad Units Worksheet (xmcd)
* [[Attach:Mathcad_units.pdf | Mathcad Units Worksheet (pdf)]]

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