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Evaporation and Condensation
Evaporation is an endothermic process that is the conversion of a liquid to the vapor state by the addition of latent heat. Condensation is a type of chemical reaction in which water or another simple substance is released by the combination of two or more molecules. The term is also used to describe the process by which a gas or vapor changes to a liquid. In weather, evaporation occurs when water on the earth changes to water vapor and enters the atmosphere. The opposite of evaporation, condensation transforms water vapor in the atmosphere into a liquid, often resulting in precipitation, most commonly in the form of rain or snow.
500 Questions
How evaporation causses a Cooling effect?
Asked by Wiki User
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.
What is the of evaporation dish?
Asked by Wiki User
an open generally shallow concave container for holding liquids for evaporation.
How is evaporation and sublimation related?
Asked by Wiki User
Evaporation is when a substance changes from a liquid to a gas, from heat.
Sublimation is when something is cold enough that it turns into a gas, straight from a solid.
like when it's freezing cold outside, and ice is still getting smaller, and there is no puddle around it, it is because it is sublimating.
Sublimation can be used to extract chemicals, that are heat sensitive. Replacing the evaporation method.
How does temperature affect the evaporation of water?
Asked by Wiki User
Liquid does not need to be heated to evaporate. This should not be confused with boiling when heat is certinly required.
In a liquid, all the particles have a range of energies; some are stationary and some are moving very quickly. This quicker ones may have enough energy to overcome the energy holding them in the liquid (intermolecular forces such as Van der Waals). When these higher energy molecules leave, the lower energy molecules still remain and so the average energy of the molecules decreases. This registers as a drop in temperature.
When you get Acetone (nail varnish remover) on your hand, you should be able to feel this effect. It is also what causes you to feel cold after leaving a swiming pool on a hot day.
I hope you found this useful
ANSWER
The physical states of matter depend on the amount of energy holding the matter in a certain state versus the amount of energy in the substance that makes the molecules try to escape (and evaporate). Basically, energy is required for evaporation to take place. This is why evaporation causes the cool feeling on your body as you dry off. The water just takes energy (heat) from your body to help push the molecule out of liquid solution. Remember that pressure (generally from the atmosphere) is what holds a liquid in the liquid state. If you remove the pressure of the atmosphere from just about any liquid, it will vaporize whether more energy is added to the liquid or not. Unless the liquid is already at nearly absolute zero, it will have enough heat energy to evaporate in the absence of air pressure holding it in the liquid state. A quick, one sentence answer to this question: Evaporation will COOL the liquid off. Evaporation will cause heat energy to be removed from somewhere (generally the liquid from where the molecule evaporated from).
Answer by brand new09
Well, according to the question it can be concluded that when a liquid is boiling and the water molecules are gaining excess energy, eventually excited to evaporate in the atmosphere. The affects are not much because the liquid's temperature is already high to boil the liquid. Evaporation is the process when a liquid get extra energy to energize the water molecules (H20) to gain energy to change their form to gas to escape into the atmosphere. The temperature of the liquid will will cool down as the molecules escape with the extra energy to change their form to gas.
How does condensation differ from boiling?
Asked by Wiki User
Both are the process of water changing state: first condensation is changing from vapor to liquid and evaporation is from liquid to a gas.
Is condensation a liquid?
Asked by Wiki User
condensation does not for clouds. water vapor comes up to the clouds and turns back to water. then it falls as precipitation. which is fog , sleet, snow, rain and hail. and fog is a low cloud.
What temperture does evaporation occur at?
Asked by Wiki User
All temperatures above melting point. Also dependent on partial pressure of liquid in surrounding gas.
Depends on the liquid, some examples ( degrees celcius at boiling point )
jet fuel 163
linseed oil 287
petrol 95
water 100
Any temp. really, 0 degrees celsius. Ice will start to melt at 0 degrees. I think evaporation occurs at any temp. However if it is very hot the evaporation process time will decrease and happen a lot faster.
It has to be hot outside but in the summer it will always evaporate because its hot and in the winter if its not too cold to where the water freezes you can evaporate it.
100 degrees Celsius for water
But only about 69 degrees for alcohol.( iodine etc....)
What is evaporation condesation and precipitation part of?
Asked by Wiki User
Evaporation, condensation and precipitation is part of the water in weather. Evaporation is the water cycle in which water is turned into vapor and rises to form clouds which eventaully condense and drop the vapor int he form of rain or snow. Rain ro snow is called precipitation. Condensation is the poitn where cold and hot meet to cause a warming up fo cold which produces water.
What factors affect whether or not you have condensation?
Asked by Wiki User
saturated air and dewpoint temperature much lower than air temperature
Does water vapor gain or lose heat when it condenses?
Asked by WritingLover
removed. The heat in the glass is being extracted causing the outside of the glass to have water on it.
Why evaporation causes cooling?
Asked by Wiki User
Evaporation causes a cooling effect because it carries heat away from the body. Sweat brings heated blood and water to the surface where evaporation carries it away.
Compare and contrast between boiling point and condensation point of a substance?
Asked by Wiki User
There is nothing called "condensation point". At least not such thing related to do condensation of gases. But there is a fixed point at a certain pressure, called "boiling point", means, the temperature at which a liquid boils.
But condensation does not occur at a fixed temperature like boiling. Think this way, you can see water drops on a cold bottle that occur by condensation of water vapor in the air. For this, just a cold bottle is enough, not a bottle at a certain temperature.
What is one thing needed for condensation to occur?
Asked by Wiki User
There must be moisture in the air. When cooled, the water vapor in the air becomes liquid water- but if there is no moisture, then it cannot condense.
Is heat energy being added or removed during the process of evaporation?
Asked by Wiki User
In condensation heat is removed
In evaporation heat is added
Why does condensation form on the outside of a cool glass of water ona hot humid summer day?
Asked by Wiki User
Water vapor or water in the form of a gas exists in the atmosphere. If you listen to weather reports, you will hear a number called the dew point. That number is the temperature. When the temperature drops below that number, the water in the atmosphere condenses. It turns to dew. If you have a glass with ice in it, the temperature on the outside of the glass is below the dew point. When water vapor hits that glass, it turns to dew. In your case, it was a can of soda that became covered with dew. If the dew point had been below the temperature of the soda can, you would not have seen any dew form on the can of soda.
What happens to the water molecule during condensation?
Asked by Wiki User
A hydroxide is taken from the glucose and a hydrogen is taken from the fructose. This leaves the glucose and fructose a place to bond. A hydroxide(HO) and a hydrogen (H) make a water molecule (H2O)
How does altitude affect evaporation?
Asked by Wiki User
Pressure is the main factor which shows effect on evaporation of water. As we move upwards or high altitude , Air pressure decreases and water boils quickly.
So for low average kinetic energy water molecules under go evaporation quickly
The taller it is, or higher, the faster the water evaporates!
Is it true or false that the energy for evaporation comes from the sun?
Asked by Wiki User
It is true. The sun's energy drives all parts of the water cycle, including evaporation.
How long would it take for 5 ml of water to evaporate?
Asked by Wiki User
How hot? How much surface area? What is the humidity in the ambient air? Your question cannot be answered without more information.
How evaporation causes cooling 6 examples?
Asked by Wiki User
In a given liquid, the atoms or molecules which are moving the fastest, and hence have the highest temperature, are the ones that are most likely to leave the liquid and evaporate. The atoms or molecules that they leave behind will therefore be cooler. Examples:
evaporating water
evaporating alcohol
evaporating liquid nitrogen
evaporating glycerol
evaporating liquid helium
evaporating acetone.
Will condensation or evaporation take place if someone takes out a cold drink on a hot day?
Asked by Wiki User
Most likely condensation will form because when temperature drops the humidty rises. If the temperature of the can is low enough the humidty in the hot air when taken down to the temperature of the cold can will condense. The same thing happens on a lawn when the temperature of the air cools enough overnight to form dew.
What happen to water in process of condensation?
Asked by Wiki User
The changing of gaseous water (H2O vapor) into liquid water refers to two named processes. The first is a phase change from condensation, and the other is exothermic through the release of heat.
