Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion
Discussion Forum : Hydraulics and Fluid Mechanics - Section 8 (Q.No. 14)
14.
The density of a liquid in kg/m3 is numerically equal to its specific gravity.
Discussion:
23 comments Page 1 of 3.
Muhammad Waqas said:
9 years ago
You are right @Shail.
The statement should be like, The density of a liquid in g/cm^3 is numerically equal to its specific gravity. Why?
Specific gravity = density of a liquid / density of water...............(i)
Rearranging the equation.
Density of a liquid = (specific gravity)(density of water).
As density of water = 1 g/cm^3.
So,
Density of a liquid = (specific gravity)(1 g/cm^3).
Density of a liquid = specific gravity in g/cm^3.
Proved
The statement should be like, The density of a liquid in g/cm^3 is numerically equal to its specific gravity. Why?
Specific gravity = density of a liquid / density of water...............(i)
Rearranging the equation.
Density of a liquid = (specific gravity)(density of water).
As density of water = 1 g/cm^3.
So,
Density of a liquid = (specific gravity)(1 g/cm^3).
Density of a liquid = specific gravity in g/cm^3.
Proved
Deepak maheshwari said:
8 years ago
Statement is incorrect.
For example.
If you consider the mass density of water equal to 1000 kg/m3. Then specific gravity of water is equal to 1.
But 1 is not equal to 1000.
If you consider mass density in gm / cm3 which is 1 gm/cm3 for water then specific gravity is also 1.
1=1.
So the statement is correct for only unit gm/cm3.
The statement is not correct for unit KN/m3.
For example.
If you consider the mass density of water equal to 1000 kg/m3. Then specific gravity of water is equal to 1.
But 1 is not equal to 1000.
If you consider mass density in gm / cm3 which is 1 gm/cm3 for water then specific gravity is also 1.
1=1.
So the statement is correct for only unit gm/cm3.
The statement is not correct for unit KN/m3.
Sai prasad said:
4 years ago
As we know density of water is 1000kg/m^3.
Spc. Gravity=density of any fluid/density of water;
S.g=density of any fluid/1000kg/m^3.
Ex:-sg of water is 1 ...mercury 13.6.
The density of water 1000kg/m^3.
S.g of water=1000/1000 = 1.
So, here the kg/m^3 is numerically is equal to s.g.
Spc. Gravity=density of any fluid/density of water;
S.g=density of any fluid/1000kg/m^3.
Ex:-sg of water is 1 ...mercury 13.6.
The density of water 1000kg/m^3.
S.g of water=1000/1000 = 1.
So, here the kg/m^3 is numerically is equal to s.g.
(2)
Fakhre Alam said:
1 decade ago
In the metric system the density of water at 4°C is 1.00 g/cm3 (or 1.00 g/mL), 3 equivalent to 1000 kg/m3, and hence the specific gravity (which is dimensionless) of a liquid has the same numerical value as its density expressed in g/mL or Mg/m3.
Saurabh Mangal said:
2 years ago
The assertion is incorrect since density is expressed in kg/m3. If the density was provided in gm/cc, then the statement could have been accurate, as the specific gravity of a fluid is equal to its density in gm/cc.
(1)
Brij kishor said:
8 years ago
As density of water is also equal to 1000 kg/m^3.
So,
Density of a liquid = ( specific gravity )( 1000 kg/m^3 )
Density of a liquid = specific gravity in 1000 kg/m^3.
in this way the given statement is true.
So,
Density of a liquid = ( specific gravity )( 1000 kg/m^3 )
Density of a liquid = specific gravity in 1000 kg/m^3.
in this way the given statement is true.
Akshay said:
6 years ago
Specific gravity says that's used fluid is how time in weight of tested fluid(water).
So it can't say that the density May equal to the specific gravity.
So answer will be B correct.
So it can't say that the density May equal to the specific gravity.
So answer will be B correct.
Saurabh chauhan said:
7 years ago
@Brij Kishor
The statement is wrong.
The Density of liquid = its specific gravity.--> False.
The density of liquid = its specific gravity * 1000--> True.
The statement is wrong.
The Density of liquid = its specific gravity.--> False.
The density of liquid = its specific gravity * 1000--> True.
Harsh Shukla said:
6 years ago
Density of water = 1000kg/m3.
The specific gravity of water = 1.
How is 1 numerically equal to 1000.
Answer = False.
The specific gravity of water = 1.
How is 1 numerically equal to 1000.
Answer = False.
(5)
Ali Hamza said:
5 years ago
Why to discuss water only?
Fluid name is not mentioned. What about other fluids?
So it must be false right?
Fluid name is not mentioned. What about other fluids?
So it must be false right?
(3)
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