- noun a force that causes a fluid or solid to be drawn into a space because of the difference between the external and internal pressures
- The absorption of water from a plaster finish coat by the base coat, gypsum block, or gypsum lath, functioning to increase bond and promote better adhesion to the base.
- The adhesion of mortar to brick.
- A vacuum effect created when wind load on a building creates a load in an outward direction.
- noun a force created by the action of sucking