# 4.11. Initial Conditions

An initial condition for the DOF of every active equation is required on every block. The `Initial Condition` block goes in the `Fuego Region`.

    # Fuego Region scope
    Begin Initial Condition Block FlowInit
        Volume is block_1
        Pressure   = 0.0
        X_Velocity = 0.0
        Y_Velocity = 0.0
    End

There can be multiple `Volume is` lines within a given block, and you can have more than one `Initial Condition` block to apply different conditions to different blocks.

If you omit an initial condition for any active equation on any block, Fuego will throw an error telling you which equation is missing and which blocks it is missing on.

For the complete list of commands, see the command summary