the boiling point of water is 100C. THEN WHY WATER KEPT IN SUN EVAPORATES WITH OUT REACHING THIS TEMPERATURE?

Question

IN SUN THE TEMPERATURE DOES NOT REACHES 100C. (NEITHER IT BOILS)

Answer 1

Water that is evaporating is not the same as water boiling. evaporation is the loss water from the surface that is still water in very small amounts that become suspended in the air. Boiling that occurs at 100c is a state change in the water where the bonds in the water lattice have been broken. The steam then coming in contact with the cooler surrounding air then rapidly cools and forms water droplets on cooler surfaces or in the air and just like fog is a saturation of the air with water and you can see it so you also can see the steam re condensing into water in the air.

Answer 2

That's because boiling and evaporation are entirely 2 different processes. Evaporation is a surface phenomenon.
Certain molecules of water(or any liquid) tend to have higher kinetic energy than the others. In that case those molecules can leave the surface of the liquid well before it reaches its boiling point. Those molecules use the latent heat from the surface they are touching and hence evaporate well before they reach their boiling point. This is also one of the main reasons why evaporation causes cooling( because it uses the latent heat from the surface it is touching. So the surface loses heat and that causes cooling(just for extra info.))
Hope this helps you:)

Answer 3

First understand that water is converted into vapour at any temperature.

When you open a refrigerator, you can observe water vapour is coming out. The temperature inside the refrigerator is very less than the room temperature.

Observe the water vapour coming out of water in a kettle on a stove, even before water begins to boil.

Thus the process of vaporization of water takes place at any temperature.

Consider water at room temperature.

Even at this temperature water gets evaporated.

When we slowly rise the temperature the rate of evaporation increases.

Thus higher the temperature greater is the rate of evaporation.

Now let us assume that the atmospheric pressure is one atmosphere. (Near sea level places)

When the temperature reaches 100 degree centigrade water begins to boil.

At this temperature, whatever be the amount of heat we add, (i.e. even if we increase the flame of the burner) the temperature will not rise and all the water gets evaporated into steam at this constant temperature.

This we call as the boiling temperature.

Thus given the pressure there is a maximum temperature above which we cannot increase the temperature of water. This temperature is boiling temperature at that pressure.

And below this temperature, water is being continuously evaporated.

When the pressure is lowered the boiling temperature is lowered. That is even at low temperature water begins to boil.

Vaporization consists in the separation of fast moving particles from the surface of a liquid.

When heat is applied, the temperature increases and it is the indication of the increase in the speed of the fast moving particles. The particles are removed quickly from the surface of the liquid.

If the vaporized molecules are continuously removed from the surface of the liquid, the process continues until all of the liquid has been transformed into vapour.

In a closed vessel, two processes take place. Water vapour condenses to water and water gets converted into vapour.
The vaporization of process continues until a dynamic equilibrium corresponding to the given temperature has been established.

If equilibrium exits, we say that the vapour is saturated. Other wise the liquid will completely vaporize without equilibrium being established.

Finally regarding water, if the pressure is 10 atmosphere, then water will boil at 150 degree centigrade. Under this pressure you cannot raise the temperature of water because the temperature will not rise till all water is converted into vapour. But under the same pressure water will evaporate even the temperature is below 150 degree centigrade.

Answer 4

See according to me when u take a water in a beaker an start heating it then as the temp rises water starts boiling but the temp at which the whole water boils is 100c lly when water is kept in the sun the intensity of the sun's rays provoke water to star evaporating now if u take sea water , in the sea water there are salts and minerals due to which bp decreases. Therofors u see we build salts pans either near the sea or in desert regions

Answer 5

At the interface of a gas and liquid there is an equilibrium going on, based on the pressures acting on the surface. Some molecules are going from gas to liquid phase, and vice versa. In evaporation of water, some of the gas phase above the surface is carried away, and this shifts the equilibrium, causing more liquid to go into gas phase.

Eventually, the liquid will be gone.

Answer 6

Water has a positive vapor pressure at any temperature. That pressure is 1 atmosphere at 100 C, but is not zero at normal temperature. Therefore, evaporation occurs. For a tabulation of water vapor pressure versus temperature, see the reference or any steam table.

Answer 7

Evaporation is the process of changing of a liquid into it's vapours even below it's boiling point.Evaporation of a liquid can take place at all temperatures.The rate of evaporation depends upon:-
temp of a liquid
nature of a liquid
velocity of blowing wind
surface area of a liquid
qty of H2O vapours already present in air.

Answer 8

there it self the ans in ur question..water in the sun evaporates not boils...evaporation is different from boiling .in the evaporation surface molecules of water gets heated by the sun rays,and by taking heat from remaining water body and escapes in the air and again falls back...after some time all these escaped molecules form as vapour on the surface.. and exerts pressure which is called vapour pressure..at this pressure water easily evaporates into the atmosphere...this phenomenon is common in drying of clothes,decrease in water level in pools.. evaporation of petroll (gasoline) ...etc..

Answer 9

whater in the sun in not much becose the temperature is about 10 to the power of 5 inside and the pressure kind of the same order. The inside is a mixture of ionized gase and free electron, very close to totaly ionized. No chemical nondage can be created.So no h2o can actualy be seen. The state is another phisical state of the mater. it is the most predominant state in the univers, more then 99.9%. even in the photosfere were the tepreature is calculated to about 6000 celcius the gase is in theplasma state.

Answer 10

Boiling means that the partial pressure of water vapor exceeds the pressure of the water at some depth below the surface. This is why water 'boils' at a lower temperature at high altitudes.

Doug