Answer / nagesh

Density of a substance is the ratio of its MASS to VOLUME.
But Specific gravity is the ratio of DENSITY of substance
to DENSITY of Water. Since the density of water is
1000Kg/m^3, it is taken as the standard reference substance
against which other substance's density are compared.

Answer / mob

Density = mass/volume

Sp. gravity = ratio of density of substance/density of water

Sp. gravity does not have any unit

Answer / amit patil

Density is a measure the mass of an object has divided by
the volume that object occupies. In SI units it is
expressed in kilograms per cubic metre (Kgm-3).

Specific gravity is a measure of the relative weight of a
substance when compared to the same volume of water. The
specific gravity is calculated by taking the density of a
substance and dividing it by the density of water. In SI
units we are dividing Kgm-3 by Kgm-3 so it has no units.

For example a substance that has a specific gravity of 7.0
is seven times as dense as water and will have a weight 7.0
times as great as an identical volume of water. A substance
with a specific gravity of 0.5 is half as dense as water
and will weigh half as much as an equivalent volume of
water.

In the SI system water has a density of 1,000 kilograms per
cubic meter, 1,000 Kgm-3, so in reality, when you convert
the density to specific gravity you are actually dividing
by 1,000.

Specific gravity is important when you are trying to
calculate buoyancy. If a substance has a specific gravity
less than 1.0 then it is less dense than water and will
float. If it has a specific gravity greater than 1.0 then
it is more dense than water and will sink

Answer / karthick

specific gravity is defined as the ratio of density of a
liquid to density of water.so it always measures density
w.r.t water. this is the difference

Answer / ankit singh

some corrections for the first,second...answers..
in specific gravity, the standard refers to a substace,
which shud be a fluid, i.e. it may be WATER for liquids &
air for gases...not necessarily water always..

Answer / rajesh

Specific gravity is the Ratio of Density of a liquid
(Kg/cubic metr) to the density of Standard liquid (water -
1000 kg/cubic metr)

Density of liquid is defined as Mass per Unit volume
(Kg/cubic metr)
We take Standard liquid as WATER ( Hydraulics), and
Standard Gas as Air (Thermodynamics), as Gas or Liquid both
are Fluids.
Reason for taking std reference as Water or Air --
Water is Universal Solvent,chemically inactive,freely
available etc.
Air posseses all thermodynamic properties, also does not
affect chemically to components,freely available etc.

Answer / m.wajid (mlcfl)

plz explain why water density taken as a reference in sp
gravity
as
Sp. gravity = ratio of density of substance/density of water

Answer / arjun&mani

specific gravity is nothing but ratio of substance and its
reference dimentionless(no physical unit)

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