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Grade: 12th pass

                        

comparision between melting &boiling point ionic ,covalent ,interstitial hydrides.

2 years ago

Answers : (1)

Arun
25359 Points
							

Boiling Point:

The boiling point of a substance is the temperature at which the vaporpressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

The boiling point of a liquid varies depending upon the surrounding environmental pressure. A liquid in a partial vacuum has a lower boiling pointthan when that liquid is at atmospheric pressure. A liquid at high pressure has a higher boiling point than when that liquid is at atmospheric pressure. For a given pressure, different liquids boil at different temperatures. For example, water boils at 100 °C (212 °F) at sea level, but at 93.4 °C (200.1 °F) at 2,000 metres (6,600 ftaltitude.

Melting Point:

The melting point (or, rarely, liquefaction point) of a solid is the temperature at which it changes state from solid to liquid at atmospheric pressure. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at standard pressure. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point.

Differences Between Boiling Point and Melting Point:

  1. Melting point and boiling point both describe temperatures at which phase changes occur in substances. The main difference between boiling point and melting point is that the melting point is defined as the temperature at which solid and liquid phases are in equilibrium, whereas the boiling point is the temperature at which the vapour pressure of a liquid is equal to the external pressure.
  2. The melting point is a defined for solids when it transfers from solid state to liquid state.
  3. The boiling point is defined for liquids for a state change from liquidto gas.
  4. Boiling point is highly dependent on the external pressure whereas the melting point is independent of the external pressure.
  5. As the verb differences boiling point is to boil and melting point is to melt.
2 years ago
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