Question

Define the following:-
1. Surface phenomenon
2. Bulk phenomenon
3. Latent heat of fusion
4. Latent heat of vapurisation
5. Melting point
6. Boiling point
7. Freezing point
8. BEC

Answer 1

Hey mate,

1. Surface phenomenon = Adsorption is a surface phenomenon. It is the phenomenon of accumulation of large number of molecular species at the surface of liquid or solid phase in comparison to the bulk. The process of adsorption arises due to presence of unbalanced or residual forces at the surface of liquid or solid phase.
2. Bulk phenomenon = Bulk phenomenon: The process which involves total molecules including interior molecules along with surface molecules is called as bulk phenomenon. ... When compared with evaporation it involves only surface molecules, so evaporation is considered as surface phenomenon but not as bulk phenomenon.
3. Latent heat of fusion = The heat of fusion, also known as the latent heat of fusion, is a category of latent heat describing the energy for the phase change between a liquid and a solid to occur without a change in temperature. ... Latent heat is the heat per mass unit required for a phase change to occur.
4. Latent heat of vaporisation = The term latent heat of vaporisation can be defined as the amount of heat needed for the conversion of 1kg of liquid at its boiling point to gas at same temperature. It differs among different liquids. Particles of water vapour at 100oC (373K) have more energy than liquid water at same temperature.
5. Melting point = The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point.
6. Boiling mate = The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. ... For example, water boils at 100 °C (212 °F) at sea level, but at 93.4 °C (200.1 °F) at 1,905 metres (6,250 ft) altitude.
7. Freezing point = The freezing point is the temperature at which the liquid solvent and solid solvent are at equilibrium, so that their vapour pressures are equal. When a non-volatile solute is added to a volatile liquid solvent, the solution vapour pressure will be lower than that of the pure solvent.
8. BEC = A Bose–Einstein condensate (BEC) is a state of matter (also called the fifth state of matter) which is typically formed when a gas of bosons at low densities is cooled to temperatures very close to absolute zero (-273.15 °C).

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