Melting point vs Boiling Point

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 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 BeF ₂ 555 1327 ZrF ₄ 903 600(sublimes) Li- NaF -KF 454 1570 LiF-BeF ₂ 458 1400 LiF-NaF-BeF ₂ 315 NaF-BeF ₂ 340 1400 NaF-ZrF ₄ 500 1350 Salt Constituents LiF 845 1681 NaF 995 1704 KF 856 1502 RbF 775 1408 BeF ₂ 555 1327 ZrF ₄ 903 600(sublimes) Li- NaF -KF 454 1570 LiF-BeF ₂ 458 1400 LiF-NaF-BeF ₂ 315 NaF-BeF ₂ 340 1400 NaF-ZrF ₄ 500 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.