1. Convert the dimensions of the sheet to inches:
   • Lunghezza: 4 piedi = 48 pollici
   • Larghezza: 8 piedi = 96 pollici
2. Convert the thickness to decimal form:
   • 3/16 pollice = 0.1875 pollici
3. Calculate the area of the sheet in square inches:
   • Area = Length x Width = 48 inches x 96 pollici = 4,608 square inches
4. Calculate the volume of the sheet in cubic inches:
   • Volume = Area x Thickness = 4,608 square inches x 0.1875 pollici = 864 pollici cubi
5. Convert the volume from cubic inches to cubic feet:
   • Volume (cubic feet) = Volume (pollici cubi) / 1728 = 864 pollici cubi / 1728 = 0.5 cubic feet
6. Determine the density of aluminum. The density of aluminum is typically around 0.098 libbre per pollice cubo.
7. Multiply the volume in cubic feet by the density to calculate the weight in pounds:
   • Peso (lbs) = Volume (cubic feet) x Density = 0.5 cubic feet x 0.098 lbs/in³ ≈ 0.049 lbs

Perciò, a 4×8 3/16 foglio di alluminio would weigh approximately 0.049 libbre.