### 28.1.2. Basic Settings Tab for Additional Variable Objects

The Basic Settings tab is used to define the fundamental properties of an Additional Variable. It is accessible by creating a new Additional Variable or by editing an Additional Variable listed in the tree view.

#### 28.1.2.1. Variable Type

- `Specific`

  The Additional Variable is solved on a per-unit-mass basis. For details, see Volumetric and Specific Additional Variable in the CFX-Solver Modeling Guide.

- `Volumetric`

  The Additional Variable is solved on a per-unit-volume basis. For details, see Volumetric and Specific Additional Variable in the CFX-Solver Modeling Guide.

- `Unspecified`

  The Additional Variable is defined in terms of an algebraic expression using CEL. For details, see Unspecified Additional Variables in the CFX-Solver Modeling Guide.

#### 28.1.2.2. Units

Specify the units that describe the Additional Variable. For details, see Additional Variables in the CFX-Solver Modeling Guide.

#### 28.1.2.3. Tensor Type

The Additional Variable's Tensor Type can be set to `Scalar` or `Vector`. If an Additional Variable is defined as type `Vector`, the components of a vector algebraic equation can be defined at the domain level.

Vector Additional Variables cannot be directly referenced in CEL expressions. The syntax for referencing a component of a vector Additional Variable is as follows:

    <Component Name>.<Additional Variable Name>_x

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