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Byju's Answer
Standard IX
Physics
Why Objects Float or Sink
What is the m...
Question
What is the minimum density of water?
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Solution
Minimum density of water:
The term ‘density’ means the mass present in a unit volume of a particular substance.
The density of water changes according to the salt and minerals in it.
The minimum density of water or the least density of water is at
0
∘
C
.
The minimum density at
0
∘
C
is
0
.
9998
g
/
c
m
3
.
The formula for density is
ρ
=
m
v
, Here
ρ
=
d
e
n
s
i
t
y
,
m
=
m
a
s
s
, and
v
=
v
e
l
o
c
i
t
y
The unit for density is commonly expressed in
g
r
a
m
/
c
m
3
.
The following graph shows the variation in density of water with temperature.
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Q.
A cubical box is to be constructed with iron sheets 1 mm in thickness. What can be the minimum value of the external edge so that the cube does not sink in water? Density of iron = 8000 kg m
−3
and density of water = 1000 kg m
−3
.