Why mechanical seal is called mechanical?

Mechanical seal uses mechanical components like spring, screws, spring retainer and seal faces to seal the gap between rotary (shaft) and stationary portion (housing) of a pump. Mechanical seal contains stationary face and rotary face combination to create the seal. The rotary and stationary faces are pressed against each other with the help of mechanical spring to achieve the seal. Hence it is called mechanical seal. It is in contrast to other types of seals like gland packing and lip seals where sealing is achieved by means of non-mechanical things.  the gland ropes are just braided ropes wrapped around the shaft of the pump to seal the gap between shaft and the housing.