Specific volume (𝞶)
It is defined as the volume of a fluid occupied by a unit mass or volume per unit mass of a fluid is called specific volume.
Specific volume (𝞶) = 𝑉𝑜𝑙𝑢𝑚𝑒/𝑀𝑎𝑠𝑠 = 1/𝞺 {𝑚3/𝑁}
Problem:
1. What is the specific volume of water at 4oC is ……..
2. What is the specific volume for air ………
Specific gravity (S)
The ratio of specific mass (density) of a given liquid to the specific mass (density) of water (standard fluid) at a standard reference temperature (4oC) is defined as specific gravity (S).
Specific gravity (S) = 𝐷𝑒𝑛𝑠𝑖𝑠𝑖𝑡𝑦𝑡𝑒𝑠𝑖𝑛𝑔 𝑓𝑙𝑢𝑖𝑑/𝐷𝑒𝑛𝑠𝑖𝑠𝑖𝑡𝑦𝑠𝑡𝑎𝑛𝑑𝑎𝑟𝑑 𝑓𝑙𝑢𝑖𝑑{𝑁𝑜 𝑢𝑛𝑖𝑡𝑠}
Example:
Density of mercury is 13600 kg/m3. What is the specific gravity.
𝑆𝐻𝑔 = 13600/1000 = 13.6
Problem:
1. Find out the specific gravity of oil having density of 800 kg/ m3?
2. If the specific weight of oil is 8829 N/m3 . Find its specific gravity, density and specific volume?
