A unit system may be optionally specified during AIM instance initiation.

• If no unit system is used, AIM inputs, which otherwise would require units, will be assumed unit consistent.
• If a unit system is provided, all AIM input values which have associated units must be specified as well. A unit system may be specified via a JSON string dictionary for example:
  unitSystem = "{"mass": "kg", "length": "m", "time":"s", "temperature": "K"}"
  or
  unitSystem = "{"mass": "slug", "length": "in", "time":"s", "temperature": "R"}"

JSON String Dictionary

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

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

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

• time = "None"
  Time units - e.g. "second", "s", "minute", ...

• temperature = "None"
  Temperature units - e.g. "Kelvin", "K", "degC", ...