However, on September 23, 1999, communication with the spacecraft was lost as the spacecraft went into orbital insertion, due to ground based computer software which produced output in Imperial units of pound-seconds (lbf-s) instead of the specified metric units of Newton-seconds (N-s). The spacecraft encountered Mars at an improperly low altitude, causing it to incorrectly enter the upper atmosphere and disintegrate.
There are a few reasons why a scientist might create an equation that doesn't use SI units. One possible reason is that the equation is more easily understood or used in a different unit system, especially if the research is being conducted in a country that uses a different unit system. Another reason may be that the equation is derived from a different theory or concept that doesn't align with SI units.
Scientists typically convert non-SI units to their SI equivalents and use those values in their equations to ensure accuracy and consistency. They may also include conversion factors to help others replicate their work.
It depends on the specific context of the research. In some cases, using non-SI units may make the equations simpler and easier to use. In other cases, it may align better with the underlying theory or concept being studied.
It is not uncommon for scientists to use non-SI units in their equations, especially in fields like chemistry and engineering where different unit systems are commonly used. However, it is important for scientists to clearly state and convert any non-SI units used in their work to maintain accuracy and consistency.
Non-SI units can potentially affect the reproducibility of scientific research if they are not clearly stated and converted in equations. This is why it is important for scientists to follow standard practices and clearly state any non-SI units used in their work to ensure accuracy and reproducibility.