Répondre :
plaque PVC:
volume = 500*400*0.8 = 160000 mm3 = 160 cm3
masse volumique(polypropylène) = 0.9 g/cm3
masse = 160*0.9 = 144 g
plaque PVC:
volume = 500*400*0.8 = 160000 mm3 = 160 cm3
masse volumique(polypropylène) = 0.9 g/cm3
masse = 160*0.9 = 144 g