'K'

In every mathematical equation,
          present by any means;
A constant yet it constantly changes
          from chemical reactions showing how compounds dissociate
          to Hooke's Law of Elasticity, stiffness it describes.

"K."

Just like that I know we'll part,
          our equilibrium shifts to the left;
Going back to what we once were,
          barely acknowledging each other's existence,
          strangers passing by; hesitant, stiffly saying hello.

Tell me where do I look
for the value I lost
when K became constant,
constantly we changed.