### 8.3 Solution Question

Posted:

**Sun Jan 14, 2018 8:51 pm**In the solutions manual, it says we use change of volume= -(pi)(r^2)(d). Why would we use the radius of the initial diameter and for d we use the second diameter?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=129&t=25516

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Posted: **Sun Jan 14, 2018 8:51 pm**

In the solutions manual, it says we use change of volume= -(pi)(r^2)(d). Why would we use the radius of the initial diameter and for d we use the second diameter?

Posted: **Sun Jan 14, 2018 10:31 pm**

If I am not mistaken d is the distance that the surface moved and gives us the correct units for volume