Heat of vaporisation Formula
Heat of vaporisation Formula
There are three possible phases of substances: solid, liquid, and gas. Some substances can be transformed from one phase to another by heating and cooling. Liquids transform into gases through vaporisation, which is a phase change. The physical changes necessary to switch phases require a specific amount of heat. An enthalpy of vaporisation is the amount of energy or heat consumed per unit mass during the vaporisation of any liquid.
Concept of the Heat of vaporisation
It is necessary to remove the energy from the gas in order to condense the water vapour into its liquid phase. Condensation of water vapour requires the same amount of energy per unit mass as vaporisation. There is no known value higher than the heat of the vaporisation of water. The heat of vaporisation is the amount of heat needed to turn one gram of liquid into a vapour, without raising its temperature. The heat of the vaporisation of water at different temperatures is used as a standard, and the units are calories per gram. It is a type of latent heat that is released during vaporisation. In this context, latent means concealed or hidden. Consequently, latent heat is the additional heat required to change the state of a substance from solid to liquid at its melting point.
What is Heat vaporisation?
The heat required to change a liquid into a gas defines its boiling point. A change in state is associated with latent heat, not a change in temperature. Consequently, evaporation of water has a cooling effect and condensation has a warming effect due to the high heat of vaporisation. In other words, the heat of vaporisation is the quantity of heat that is required to vaporize a particular quantity of liquid at a constant temperature. Steam kinetic energy is higher than fluid kinetic energy when comparing the solutions of vapour and liquid states. Whenever a liquid substance becomes a gas, it is called vaporisation. During vaporisation, liquid particles must overcome intermolecular attractions in order to vaporise. The heat of vaporisation is the energy required. For each substance, the heat of vaporisation is different, but it is constant.
The Formula for Heat of vaporisation
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Solved Examples for Heat of vaporisation Formula
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