How does water evaporate when the room temp is 25 degree centigrade.?

Question

What i mean is that if the boiling point of water is 100 deg centigrade the point at which water actually starts evaporating, then when we pour water on floor in the room which has 25 deg centigrade, how does this evaporation occurs?

I read many of ur answers, thanks for responding. As many of u hv said there is difference between boiling and evaporation, can someone clearly define them. I mean, when do u same something has actually started boiling?? isn't it when u see vapors??

Answer 1

Though water boils at 100 degree C, it keeps evaporating all the time... even when not boiling.
At 25 degree C, water still evaporate.Boiling is only dependent on the boiling point of the substance, say for water it is 100degree C.It is different for different substances.Boiling occurs throughout the liquid and bubbles are seen..
Evaporation can take place at any reasonable temperature, say 25 degree C for water. but u cannott expect iron to evaporate at this temperature.Evaporation takes place only at the surface. The rate of evaporation is dependent on the humidity and wind speed and temperature as well. Your clothes dry faster in a windy sunny day. Plant require more water in summer.
Water almost always evaporates to the atmosphere unless it is frozen.
Boiling point is the temperature at which the vapor pressure is equal to the atmospheric pressure.
water (and everything not gaseous) has some vapor pressure at any temperature (vapor pressure can be thought of as how hard the water molecules are trying to "push" into the gas phase)
the vapor pressure of water at 99 centigrade is high, almost equal to the ambient pressure, and water maintained at 99 centigrade will evaporate quickly

Answer 2

boiling point is the place where the vapor pressure is equal to the atmospheric pressure

but water (and everything not gaseous) has some vapor pressure at any temperature (vapor pressure can be thought of as how hard the water molecules are trying to "push" into the gas phase)

the vapor pressure of water at 99 centigrade is high, almost equal to the ambient pressure, and water maintained at 99 centigrade will evaporate quickly

it will not "boil" or have that bubbling effect, because the vaporizing water cannot develop the pressure to make a bubble

it takes heat to turn the water from liquid to vapor, but it can do it at any temperature, just more slowly at colder temperatures

the relative humidity also affects evaporation rate, because if the vapor pressure equals the partial pressure of water in the air, then you will get no evaporation

if you have enough water on the floor and a sealed room, you will eventually saturate the air (in equilibrium with the water at that temperature), and you will get no more evaporation

Answer 3

opps! you are wrong. water boils at 100 degree C, but it evaporate all the time... even when it have not boil.
at 25 degree C, water still evaporate.
here s the definition of the two, and you should have a clearer idea.
boiling is only dependent on the boiling point of the substance, say water is 100degree C. and boiling occurs throughout the liquid. and u see bubbles in it.
evaporation can take place at any reasonable temperature, say 25degree C for water. but u cant expect iron to evaporate at this temperature. and evaporation only takes place on the surface. the rate of evaporation is dependent on the humidity and wind speed and temperature as well. that s why your clothes dry faster in a windy sunny day.

Answer 4

evaporation and boiling are two different things.while evaporation occurs at all temperatures boiling occurs only at a specific temperature known as the boiling point.the phases have got to be in equilibrium,i mean the liquid and vapour phase of water

Answer 5

water almost always evaporates to the atmosphere unless it freezes. boiling changes the water from liquid to gas but this does not mean the water would not change if poured on the side walk outside, still happens don't it?

Answer 6

The molecules are still vibrating loosely due to the relatively warm temp and some manage to escape the surface tension of the water. This occurs at a faster rate as the temp increases because the water molecules vibrate faster.

Answer 7

water boils at 100 degree C but can evaporate at any temperature.

Answer 8

I have always understood that water evaporates at any rate...therefore zero temps are involved at this pt.

Answer 9

it's all about energy and pressure. at the top of the water is the bonds are a bit looser and it's easier to get them to break. if enough energy is around it will change forms

Answer 10

Very slowly.