Shell Size to Height & Diameter (#7)

Their size, based on a distinctive unit, categorizes the shells of aerial fireworks. The number indicates the inner diameter of the fireworks launcher.
#7 shell = shell’s outer diameter is approximately 20.0m
Fireworks with bigger shells rise higher and form a larger sphere in the air.
The height at which #7 shell scatters: approximately 250m
The diameter of which sphere the fireworks shell forms: approximately 200m (approximately 100m radius)