Alternatively, you can space the seeds 6 to 10 inches (15.24 to 25.4 cm) apart and thin your seedlings out once they reach 4 inches (10 cm) tall. At that point, you should consider thinning them out so that they are 18 inches (45.72 cm) apart.
Volume - Arcy Art Original Oil Paintings Art Dictionary. Volume is the size, bulk and dimension of a particluar object. It is an object that is usually thick, nontransparent and exists solidly and three-dimensionally in space and it is not flat. In a painting a volume is represented with light and shade and usually in spatial situation to make the nonflatness clear.
Scale in art. An artwork has a physical size; when referring to an artwork's size, we use the term scale. Scale is more than simply the object's size, however. It is the size of the art object in relation to another object. The relative size of the artwork is always compared to the size of the human body--life-sized, miniature, enormous--are all terms that use the human body as a size reference. Larger-than-life scale Chuck Close: realism in an unreal scale