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You are here: EASA 5.4 » Overview » EASA Guides » Author's Guide to EASA » Tree Objects » DIMENSIONAL GROUP

**Guide Section:** UNITS | **EASAP Tree:** UNIT MANAGER

A **DIMENSIONAL GROUP** represents a specific type of measurement, and it is used to define the unit of measure derived from the **BASE UNITS**

**EASAP→USER INTERFACE→UNIT MANAGER→BASE UNITS**

For instance, an example of a **DIMENSIONAL GROUP** is ‘Velocity’, and its unit of measure can be derived from particular **BASE UNITS** entered into the equation 'Length' divided by 'Time' (**m**/**s** or meters/second).

You can examine the existing **DIMENSIONAL GROUP**'s under the **DEFAULT UNITS** sub-branch for examples of its use.

DIMENSIONAL GROUP | |
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Essential Parameters: | |

Base Unit: | Name of new BASE UNIT created |

Optional Parameters: | |

Mass Exponent: | Exponent on Mass term in deriving BASE UNIT |

Length Exponent: | Exponent on Length term in deriving BASE UNIT |

Time Exponent: | Exponent on Time term in deriving BASE UNIT |

Angle Exponent: | Exponent on Angle term in deriving BASE UNIT |

Temperature Exponent: | Exponent on Temperature term in deriving BASE UNIT |

Base Unit Visible: | Select whether Users can see and use BASE UNIT (default→TRUE, FALSE) |