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the cause is, evaporation is escaping of fastest, which are "hottest" one, particles (molecules, atoms), which leaves the cooler ones in liquid, so median temperature dropping towards coolest particles of liquid.
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How does a cooler use thermal conductivity to keep things cold?
cooler works on the principle of evaporative cooling. Evaporation is the process of converting liquid in to vapour . In this process some part of heat is absorbed and stored (latent heat) resulting in decrease of temperature. We can feel this effect in our daily lives , like sweating in summer gives us cooling effect to body
What is the properties or characteristics of evaporation?
Evaporated water usually ends up as Relative Humidity. or air born water due to the fact that it was allowed to evaporate due to the fact that the air was able to take on more water. the higher the RH the harder it is for the water to evaporate
Why is evaporation of water from your skin a cooling process?
In order for sweat or water to evaporate from your skin it requires heat; therefore, when it evaporates it takes some of your body heat with it.
Define flash gas and how it applies to the net refrigeration effect of the refrigeration cycle?
FLASH GAS - Instantaneous evaporation of some liquid refrigerant at the metering device due to pressure drop which cools the remaining liquid refrigerant to desired evaporation temperature.This flash gas cannot absorb any heat having a negative effect on the net refrigeration cycle
If liquid evaporates what happens?
In a liquid state, particles are moving at many different speeds. At the surface of the liquid, some of the faster-moving particles are able to escape into the air. Slower-moving particles stay in the liquid state. Slower motion means lower average energy, however, and this means lower temperature. As high-energy particles leave the surface of a liquid it then cools the surface on which it is resting. Scientist call this phenomenon evaporative cooling. Evaporating cooling is common and can be very useful.
Why evaporation takes place at all temperatures?
Evaporation is the process where some of a liquid becomes a gas at temperatures below the boiling point. In other words, its molecules escape the body of the liquid and move freely away, as a gas. An example is when water in a pan evaporates until there is no liquid left in the pan. The reason this happens is because some molecules have high enough energy to escape the surface tension of the liquid. Evaporation results in the liquid becoming cooler. Blowing on the liquid increases the evaporation.
How does evaporation cause cooling?
In evaporation a substance changes its state from liquid to gas, such as water changing to steam. For this process to occur energy in the form of heat is required (endothermic process) which has to be taken from some source (surroundings). So the source, which loses heat apparently becomes 'cooler'. Hence it can be said that evaporation causes cooling.
How does cooling affect the volume of the substance?
No. Actually evaporation is the vaporisation from the surface of liquid, so its not matters that how much volume is the water of, because the rate of evaporation is depends upon the area of surface.
What is the change of state from liquid to gas at the surface of a liquid?
When a liquid changes to a gas below its surface as well as at the surface, the liquid is at a temperature equal to or greater than its boiling point.
How does liquid become a gas when heat is removed?
The removal of heat is also known (more simply) as cooling. As a gas cools, its molecules will move more slowly. At some point the attraction between molecules will overcome their decreasing momentum, drawing them together into the more compact liquid form.
What is heat transfer in condensation?
It's complicated and hard to explain, but I'll try my best. Evaporation occurs when a liquid changes to a gas, but only on the surface of the liquid volume. The gas molecules transfer heat to the liquid molecules. An unequal distribution of heat causes some liquid molecules to become gas molecules. It is random and uneven. Energy from the sun also spawns evaporation. When evaporation does happen, the molecules that leave the liquid body takes a lot of heat with it, therefor the average temperature of the liquid decreases. Evaporation depends on heat, humidity, and air movement.
How evaporation causses a Cooling effect?
Energy must be put into whatever is being evaporated (to turn int from liquid to gas). An example is when one sweats, the body cools as the sweat evaporates, because the energy for the sweat (water) to evaporate is taken from the body/skin.
How does the application of heat cause the evaporation process to speed up?
The application of heat causes an increase in the evaporation rate of a substance because the added thermal energy will "offset" cooling that results from the evaporation. Let's look at this just a bit more closely to get a handle on things by considering water in a pan.Water molecules in a pan will be bumping around against each other in the liquid. They have some given thermal energy. The molecules tend to "stick together" and stay in the pan in the form of a liquid, but some of the water molecules at the surface will "jump out" or "escape" the liquid and become a vapor. When they do this, they take thermal energy with them in making their change of state from liquid to gas. This is evaporation. The result is that the water in the pan will cool down. Let's jump aside for a moment.If you wet your finger and blow on it, you can feel your finger cooling down. Or if you get out of a pool and a breeze swirls around you, you immediately feel cooler. Evaporation and cooling in action, and you can't miss the effect. Even a blind person could see what is going on. Now back to the example.If we consider the water in the pan, we see it cooling down, and this means that the water has less thermal energy in it. Less thermal energy in the water translates into fewer molecules of water at the surface being able to snatch enough thermal energy from the liquid to change state into a gas. The evaporation rate is slowing because the evaporating water strips thermal energy from the remaining water. Add some heat to the bottom of the pan, and this additional thermal energy will "offset" the loss of thermal energy due to evaporation. That heat may very well not only offset heat loss by evaporation, but it may easily add lots of thermal energy to the water and speed up the evaporation process. Think it through and it will make perfect sense.
What are some real life examples of evaporation?
WHen there is steam coming out of a mug full of some hot liquid like coffee. :)
What are the methods used for separating solid from liquid mixtures?
The process that separates insoluble substances from a liquid is filtration. For more information: http://antoine.frostburg.edu/chem/senese/101/matter/separation.shtml
How do sweat glands contribute to temperature regulation in mammals?
Some mammals do not sweat. For mammals that do sweat, evaporation of the sweat is how cooling works.
What kind of state change did some of the water go through to make it disappear?
Evaporation- liquid to gas
