Unit Model
==========

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Unit models represent pieces of equipment and their processes.  
These models contain the unit performance constraints and associated variables for the equipment, such as:

    - constraints relating balance terms to physical phenomena or properties (e.g. relating extent of reaction to reaction rate and volume)
    - constraints describing flow of material into or out of unit (e.g. pressure driven flow constraints)
    - unit level efficiency constraints (e.g. relating mechanical work to fluid work)

IDAES includes libraries of UnitModel classes. These models are composed of the following components:

    1. :ref:`ControlVolumeBlocks<explanations/components/unit_model/control_volume:Control Volume>`, which represent volume of material over which we wish to perform material, energy and/or momentum balances
    2. :ref:`StateBlocks<explanations/components/property_package/state_block:State Block>` and :ref:`ReactionBlocks<explanations/components/property_package/reaction_block:Reaction Block>`, which represent the thermophysical, transport and reaction properties of the material at a specific point in space and time
    3. Inlets and Outlets, which allow UnitModels to connect to other UnitModels