What is the difference between Ability and Capacity?

What is the difference between Ability and Capacity? : 
Ability : 

( 1 ) Power to do something mental or physical

Mohini has the ability to do the work. 

( 2 ) Cleverness or intelligence

He is a man of great ability. 

( 3 ) Talent

He has the great musical ability. 
Capacity : 

( 1 ) Ability to hold or contain something

This hall has the seating capacity of 5000. 

The cinema is filled to capacity. 

( 2 ) Power to produce something

Our factory is working at full capacity. 

( 3 ) Ability to produce or experience or understand or learn something

I have an enormous capacity for hard work. 

This book is within the capacity of younger readers. (This book can be understood by younger readers.)