To find the Density in SI units we will need to find the volume and the weight in SI units

25 tr.oz is roughly 777.6 grams. 

777.6g+6.5g = 784.1 g.

The volume of the tube can be found by multiplying the area of the circular crossection by the height of the tube

The area of a circle is 

A = π * r^2

The diameter is in inches an since we want SI units we will conver to cm so that it will will be the same units as the tube length. 

The diameter is d=20.32 cm

The radius is half of this or r=10.16 cm^2

The area of the circle is 10.16^2*pi

r^2 = 103.2

With Pi roughly equal to 3.14159 A= 324.2 cm^2

Multiply the Area by the length to get the volume 

In this case 324.2 cm^2 * 10.6 cm = 3436.7 cm^3

Now we can calculate the density by dividing the weight by the volume

784.1 g / 3436.7 cm^3 = 0.2282 g/cm^3

Hope this helps!
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