A unit system may be optionally specified during AIM instance initiation. If a unit system is provided, all AIM input values which have associated units must be specified as well. If no unit system is used, AIM inputs, which otherwise would require units, will be assumed unit consistent. A unit system may be specified via a JSON string dictionary for example: unitSys = "{"mass": "kg", "length": "m"}"

JSON String Dictionary

The key arguments of the dictionary are described in the following:

• mass = "None"
  Mass units - e.g. "kilogram", "k", "slug", ...

• length = "None"
  Length units - e.g. "meter", "m", "inch", "in", "mile", ...