A Cavity wall has a cavity or cavities within the wall. Examples are masonry, such as concrete block or brick with two separate wall layers separated by a continuous cavity, or a timber framed wall with a brick veneer separated by a continuous cavity. The cavity is often used as a drainage or ventilation space, reducing moisture transmission through the wall.

axial wall is an internal wall that is parallel to the long axis of the tooth

The wall of the pulp cavity is surrounded by Dentin

Simply put, a wall tie connects the inner and external walls of a cavity wall.

Most outside walls have an empty space between the 2 layers of bricks called a

cavity

.

This reduces heat loss by

conduction

through the bricks.

Heat energy reaches the interior wall

The heat energy is conducted through the wall

The air cavity between the two walls in a cavity wall acts as an insulator and reduces heat loss by conduction