This is the basic knowledge of about the Melting and Boiling point. Temperature measurements on Salt Constituents On the different elements, compounds and mixtures.

1. MELTING POINT
AND
BOILING POINT

2. CONTENTS
• What is Melting point?
• What is Boiling point?
• Differences between MT and BT?
• Diagram representation.
• Graph on Water on the behalf of MT and BT.
• Temperatures on Salt constituents.
• Apparatus.

3. MELTING POINT
1. Melting point, temperature at which the solid
and liquid forms of a pure substance can exist in
equilibrium. As heat is applied to a solid,
its temperature will increase until the melting
point is reached. More heat then will convert the
solid into a liquid with no temperature change.
2. It can be determined by introducing a tiny
amount into a small capillary tube, attaching this to
the stem of a thermometer centered in a heating
bath, heating the bath slowly, and observing
the temperatures at which melting begins and is
complete.
3. Melting point depression is the result of
different changes in entropy when melting a pure
and impure solid. As solids are restricted in atomic
motion, there is little difference in entropy between a
pure and impure solid.

4. BOILING POINT
1.The boiling point of a liquid varies according to the
applied pressure; the normal boiling point is the
temperature at which the vapor pressure is equal to the
standard sea-level atmospheric pressure (760 mm [29.92
inches] of mercury). At sea level, water boils at 100° C (212°
F).
2. The boiling point of a liquid is the temperature at which
its vapor pressure is equal to the pressure of the gas above
it. The normal boiling point of a liquid is the temperature at
which its vapor pressure is equal to one atmosphere (760
torr). Microscopic view inside a bubble in boiling water.
3. Boiling water kills or inactivates viruses, bacteria,
protozoa and other pathogens by using heat to damage
structural components and disrupt essential life processes
(e.g. denature proteins). Boiling is not sterilization and is
more accurately characterized as pasteurization.

5. DIFFERENCE IN MELTING POINT AND BOILING POINT
MELTING POINT BOILING POINT
Melting point is defined as
the temperature at which solid and liquid
phases are in equilibrium.
Boiling point is the temperature at which the
vapor pressure of a liquid is equal to the
external pressure.
the melting point is the temperature at
which a material changes from a solid to a
liquid (melts).
the temperature at which a material changes
from a liquid to a gas (boils)
the melting point is the temperature at
which molecules in a solid can move past each
other and form a liquid
The boiling point, involves liquids and gases.
Among the metallic elements,
only mercury has a lower melting point
(−38.9 °C, or −38.02 °F) than cesium.
The chemical element with the lowest boiling
point is Helium and the element with the
highest boiling point is Tungsten.
The element with the highest melting
point is Carbon.
The highest chemical element of boiling point
is Tungsten.
Melting point of water is 0℃. Boiling point of water is 0℃.

6. Diagram representation on Meting and Boiling point

7. GRAPH ON WATER : MELTING POINT AND BOILING POINT
(150)
(100)
(50)
0
50
100
150
200
TEMPERATURE
TIME
Melting point Boiling point

8. TEMPERATURES ON SALT CONSTITUENTS:
Salt Constituents Melting point (℃) Boiling point(℃)
LiF 845 1681
NaF 995 1704
KF 856 1502
RbF 775 1408
BeF₂ 555 1327
ZrF₄ 903 600(sublimes)
Li-NaF-KF 454 1570
LiF-BeF₂ 458 1400
LiF-NaF-BeF₂ 315
NaF-BeF₂ 340 1400
NaF-ZrF₄ 500 1350

9. LAB JUNCTION'S
DIGITAL MELTING / BOILING
POINT APPARATUS
This is a
compact instrument designed
for accurate determinations
of Melting Points of solid
samples and boiling point of
liquid samples.