An alternative definition says that at constant volume and pressure, it is simply the product of pressure and the change in volume.  
It can be calculated by taking the integral of torque with respect to the angular positions before and after.  An alternative definition says that at constant volume and pressure, it is simply the product of pressure and the change in volume.  If volume is constant, then it is zero.  It is energy transferred to or from a system by means of an external force, and when friction is not involved, it is equal to the change in mechanical energy. FTP, identify the scalar quantity whose units are joules and whose derivative is power.          |
It can be calculated by taking the integral of torque with respect to the angular positions before and after.  
{Work}