Chemistry through riddles


Riddle # 4 
I am involved in all natural processes. My value in the universe is continuously increasing. Because of me, heat cannot be converted completely to work. Under certain condition my value is zero.

Questions


(a)  Who  am I ?
(b)  Why my value is continuously
       increasing in the universe ?
(c)   In what way am I involved in
       incomplete conversion of heat
       into work ?
(d)  When my value becomes zero ?      

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