# Support for new GeometricQuantity, CellSurfaceArea, in UFL

Registered by
Kristian B. Ølgaard

It might be useful to have the entire surface area of the current cell available as a geometric quantity when defining integrals.

The surface area is defined as the total area of all facets of a given cell.

The quantity can be defined for ds, dS and dx integrals.

## Blueprint information

- Status:
- Not started

- Approver:
- None

- Priority:
- Low

- Drafter:
- None

- Direction:
- Needs approval

- Assignee:
- None

- Definition:
- Approved

- Series goal:
- None

- Implementation:
- Unknown

- Milestone target:
- None

- Started by

- Completed by

### Related branches

### Related bugs

### Sprints

### Whiteboard

MER: cell.surface_area exists in UFL so this should be easy to do the moment anyone actually needs it.

MSA: I would also like to have the facet diameter.

(?)