what is the volume of 18ft

The volume of an object is typically measured in cubic units (cubic feet, cubic meters, etc.). To calculate the volume of an object, you need to know the dimensions of the object.

In this case, if you are looking for the volume of an 18ft long object, you would need to know the width and height of the object in order to calculate the volume. If the object is a rectangular prism, you would multiply the length, width, and height together to find the volume.