evaporation causes cooling explain why
evaporation causes cooling as when a liquid evaporates it absorbs the latent heat of vapourisation from its surroundings to regain the energy lost during evaporation. This absorbtion of energy from the surroundings makes the surroundings cool.
during evapourisation, particles of the liquid gain energy from the surroundings to overcome the force of attraction between them. as a result, loss of heat energy occurs in the surroundings. that is why evapourisation causes coolng sensation.
Evaporation is one of the four principal ways that heat can be transferred (the other three are radiation, convection, and conduction). Evaporation of sweat from the skin is an endothermic reaction: the reaction essentially "consumes" heat, which cools the body in the process.
For a liquid to turn into gas, either by boiling or evaporation, energy is required. This is known as the latent heat of vapourisation. In the case of boiling this is provided by external heat sources but in the case of evaporation it has to come from within the liquid itself, thus cooling it.
The energy is required to break the strong bonds between the molecules in the liquid and allow them to break free in gaseous form.
Evaporation is an endothermic (heat-absorbing) process because molecules must be supplied with energy to overcome the intermolecular forces.
Evaporation occurs at the surface of a liquid, and energy is required to release the molecules from the liquid into the gas. The use of this energy, known as latent heat, causes the temperature of the liquid to fall
Evaporation causes cooling.
For instance, take a example of earthern pot, now you will wonder how water in the earthern pot is cool throught. How do this happen?
Ans. Earthern pots contains small pores on their surface. which helps in the evaporation and by evaporation the heat is absorbed and the water in the pot remains cool.
Due to evaporation only high energy particles live the surface. this result in decrease of averagekinetic energy of the particles in the system . Kinetic energy is related to tempreture. As result there is a dropin tempreture of the system. Thus, evaporation cause cooling.
Evaporation is one of the four principal ways that heat can be transferred. Evaporation of sweat from the skin is an endothermic reaction: the reaction essentially "consumes" heat, which cools the body in the process.
evaporation is an enndothermic process i.e., the liquid absorbs heat evapouration. this heat may be provided by liquid itself or by the surroundings. on evapouration, the liquid takes heat from the surroundings. on evaporation, the liquid takes place from the other parts of the liquid, thereby cooling down. on the other hand, if the liquid takes place from the surrouindings, it causes the cooling of the surrouindings.
This is because the latent heat of vapourisation required by the subsyance to evaporate absorbs it from the substance that is in contact with it .also evaporation absorbs around 2,488 joules of heat.
Liquid evaporating from a surface has a cooling effect. And different liquids have this effect to different degrees. For example, rubbing alcohol has more of an evaporative cooling effect than does water. Alcohol is what is called a volatile liquid, meaning simply that it evaporates comparatively more quickly than water. But regardless of the liquid, the principle of evaporative cooling is the same. The idea is that in its liquid state, the substance---whether water or alcohol---has a certain heat content. Critical to this are two of the three basic phases of matter: liquid and vapor. (The solid phase is, of course, the third.)
When a liquid evaporates, its molecules convert from the liquid phase to the vapor phase and escape from the surface. What drives this process is heat. In order for the molecule to leave the liquid surface and escape as a vapor, it must take heat energy with it. The heat that it takes with it comes from the surface from which it evaporated. Since the molecule is taking heat with it as it's leaving, this has a cooling effect on the surface left behind.
because the latent heat of vapourisation required by the subsyance to evaporate absorbs it from the substance that is in contact with it .also evaporation absorbs around 2,488 joules of heat