To Determine Specific Gravity of Solids by Pycnometer Method

1. &lean and dry the Pycnometer. Tightly scre its cap. Ta'e its mass (M 1) to the nearest of *.1g. 2. Mar' the cap and Pycnometer ith a vertical line parallel to the a+is of the Pycnometer to ensure that the cap is screed to the same mar' each time. !. nscre the cap and place about 2**g of oven dried soil in the Pycnometer. $cre the cap. -etermine the mass (M 2). ". nscre the cap and add sufficient amount of deaired ater to the Pycnometer so as to cover the soil. $cre on the cap. /. $ha'e ell the contents. &onnect the Pycnometer to a vacuum pump to remove the entrapped air, for about 2* minutes for finegrained soils and about 1* minutes for coarsegrained soils. 0. -isconnect the vacuum pump. ill the Pycnometer ith ater, about three fourths full. eapply the vacuum for about /min till air bubbles stop appearing on the surface of the ater. 3. ill the Pycnometer ith ater completely upto the mar'. -ry it from outside. Ta'e its mass (M !). 4. ecord the temperature of contents. 5. 6mpty the Pycnometer. &lean tit and ipe it dry. 1*. ill the Pycnometer ith ater only. $cre on the cap upto the mar'. Wipe it dry. Ta'e its mass (M "). O$%er&'!io% '# "'("u('!io%: S() O$%er&'!io% ' C'("u('!io% No) O$%er&'!io 1 Pycnometer 7o.

*

De!ermi'!io No) +

,

2

oom Temperature

!

Mass of empty Pycnometer (M 1)

"

Mass of Pycnometer and dry soil (M 2)

/

Mass of Pycnometer, soil and ater (M!)

0

Mass of Pycnometer and ater (M ")

C'("u('!io% 3 M2 8 M1

4

M! 8 M"

5

&alculate # using formula

RES-LT:

$pecific gravity of solids at 999 *& = 99999.