Latent heat, also called heat of transformation, is the heat given up or absorbed by a unit mass of a substance as it changes from a solid to a liquid, from a liquid to a gas, or the reverse of either of these changes. It is called latent because it is not associated with a change in temperature .
What is called latent heat?
latent heat, energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature . ... The latent heat is normally expressed as the amount of heat (in units of joules or calories) per mole or unit mass of the substance undergoing a change of state.
What is called latent heat of fusion?
The enthalpy of fusion of a substance, also known as (latent) heat of fusion is the change in its enthalpy resulting from providing energy, typically heat , to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.
Who defined latent heat?
Latent heat is defined as the heat or energy that is absorbed or released during a phase change of a substance. Latent heat is related to a heat property called enthalpy. ... However, an important point that we should consider regarding latent heat is that the temperature of the substance remains constant.
Can you feel latent heat?
However, although you cannot feel it , the liquid has stored all that latent heat. The only way you will observe the latent heat is if you try to transform the water back to ice. ... Heat energy is conserved no matter how the phase change occurs. If you put heat into water, it can evaporate.
Why is latent heat important?
Latent heat is an important source of energy in the development of thunderstorms and hurricanes . Water vapor strongly absorbs infrared radiation, making it an important gas in the Earth’s heat-energy balance. In fact water vapor is the largest contributor to the greenhouse effect on Earth.
What are the types of latent heat?
- Latent Heat of Fusion,
- Latent Heat of Vaporization,
- Latent Heat of Sublimation.
What is latent heat Class 9?
The heat energy which has to be supplied to change the state of a substance is called latent heat. Latent heat does not raise the temperature . ... And since there is no increase in the kinetic energy of the particles,the temperature of a substance does not rise during the change of state.
What is specific latent heat?
Specific latent heat is the amount of energy required to change the state of 1 kilogram (kg) of a material without changing its temperature . ... latent heat of vaporisation – the amount of energy needed to boil or condense the material at its boiling point.
What is the latent heat for melting?
A total of 334 J of energy are required to melt 1 g of ice at 0°C , which is called the latent heat of melting. At 0°C, liquid water has 334 J g − 1 more energy than ice at the same temperature. This energy is released when the liquid water subsequently freezes, and it is called the latent heat of fusion.
What is latent heat of condensation?
The latent heat of condensation is defined as the heat released when one mole of the substance condenses . The temperature does not change during this process, so heat released goes directly into changing the state of the substance. It is expressed as kg/mol or kJ/kg.
Is Sweating an example of latent heat?
When you do any effort you sweat, which is basically water on the surface of your skin. When air hits your skin’s surface, the sweat will evaporate and that’s need heat (latent heat) and yes you are correct it will absorb that heat from the nearest surface to it, which is your skin.
Is sweating latent heat?
Humans use perspiration from the skin as one means of thermoregulation, because it has a cooling effect due to the latent heat of evaporation of water. ... Few other animals depend on sweating to cool down. High humidity can reduce the rate at which the body can lose heat by evaporation.
How is latent heat produced?
Latent heat is energy released or absorbed , by a body or a thermodynamic system, during a constant-temperature process. ... If the vapor then condenses to a liquid on a surface, then the vapor’s latent energy absorbed during evaporation is released as the liquid’s sensible heat onto the surface.
