# Volume of engineering solids
# Scope: Rectangular hollow enclosure with uniform walls and closed ends.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

length = 200 mm
width = 100 mm
height = 80 mm
wall = 3 mm

outer := length*width*height [cm^3]
cavity := (length-2*wall)*(width-2*wall)*(height-2*wall) [cm^3]
material := outer-cavity [cm^3]

check positive cavity: 2*wall < height

scenario alternative: length = 160 mm