Shell Size to Height & Diameter (#3)

Their size, based on a distinctive unit, categorizes the shells of aerial fireworks. The number indicates the inner diameter of the fireworks launcher.
#3 shell = shell’s outer diameter is approximately 8.6cm
Fireworks with bigger shells go up higher and form a larger sphere in the air.
The height at which #3 shell scatters: approximately 120m
The diameter of which sphere the fireworks shell forms: approximately 100m (approximately 50m radius)