Determine la caída de presión a través de una tubería de cobre tipo K de diámetro nominal de 4 pulgadas de longitud de 20 m, a través del cual circula glicerina a 80°C (r = 1.26 g/mL) si el flujo volumétrico es 1.25 pie3/min.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

f is prop to m1xm2 double m1 double force