算体积,硅胶的比重一般做0.8g/cm3算.管的体积就是外圆体积减去内圆体积.πr�0�5 *长外圆体积=3.14*(1.5+0.5)�0�5*14=175.84cm3内圆=3.14*1.5�0�5*14=98.91cm3管的体积=175.84-98.91=76.93cm3重量就是76.93*0.8=61.55g
