====== Source Sink ======

A source/sink is an abstraction for a special type of [[Compartment|compartment]], with either unlimited quantity of the modelled items ([[Material|materials]]), from where any quantity can be subtracted and then added to other [[Compartment|compartments]], or an infinite well to which any quantity can be drawn from a compartment. In short, source/sink blocks represent objects outside of the model and which either feed or pulls materials from compartments.

Note: The source/sink was previously two different objects (‘Source’ and ‘Sink’) which are now merged into one.

===== Creating a source/sink =====

From the [[Projects_window|Projects window]]

  * Expand the Project to which you wish to add the source/sink by clicking the + symbol next to it. Right-click on ‘Blocks’, or a [[Sub-system|sub-system]] in ‘Blocks’, and select **Source/Sink** from the pop-up menu.

From the [[Matrix_window|Matrix window]]

  * Right click an empty diagonal cell of the matrix and select **Source/Sink** from the the pop-up menu.

From the [[Blocks_window|Blocks window]]

  * Place the mouse anywhere over the area of this window and right-click on it. Select **New | Source/Sink** from the pop-up menu, //or//
  * In the title bar, select **Source/Sink** from the **Type** drop-down list and click on the {{:New24.png|New}} button.

===== Editing a source/sink =====

|Note|Most block properties can be edited directly in the [[Blocks_window|Blocks window]].|

The block editor is shown by right-clicking the block in a window and selecting **Edit**. In the [[Blocks_window|Blocks window]], you can also show the block editor by selecting the block and clicking the {{:Edit24.png|Edit}} button, or by double-clicking the right-most “validation” column of the block.

The block editor has three tabs:

==== Properties ====

This page lets you edit basic properties such as name, sub-system and base unit. See [[Editing_properties|editing properties]] for more information.

==== Appearance ====

This page lets you edit the visual properties of the block in the [[Matrix_window|matrix window]] and [[Graph_window|graph window]]. See [[Editing_appearance|editing appearance]] for more information.

===== See also =====

  * [[Block|Blocks]]
  * [[Blocks_window|Blocks window]]
  * [[Matrix_window|Matrix window]]
  * [[Graph_window|Graph window]]