Hello, i have problem to find dV/dp, when I have this task:

Find the distribution function of the pore volume Dv (r) in the sample as a function of the pore radius based on the measurement made on the mercury porosimeter.

p -pressure (psia) Volume(cm3)

50 0,085

200 0,142

500 0,251

1000 0,33

5000 0,461

10000 0,633

15000 0,772

20000 0,825

30000 0,860

40000 0,862

50000 0,863

60000 0,863

I find r by Washburn's equation: r=106,7/p

Dv(r)=p/r*dV/dp

## Mercury porosimetry

**Moderators:** expert, ChenBeier, Xen

- ChenBeier
- Distinguished Member
**Posts:**775**Joined:**Wed Sep 27, 2017 7:25 am**Location:**Berlin, Germany

### Re: Mercury porosimetry

I think you have to calculate each dP and dV and draw it as function.

200- 50 = 150 and 0,142-0,085 = 0,057

500- 200 = 300 and 0,251 -0,142 = 0,109

and so one

200- 50 = 150 and 0,142-0,085 = 0,057

500- 200 = 300 and 0,251 -0,142 = 0,109

and so one

### Re: Mercury porosimetry

Thank you.

I done it, but i dont what else

I done it, but i dont what else