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It starts from 100 celcius in 1atm and can be risen further.
At lower pressures eg on tops of mountains, it can be lower. Water boils when the pressure of water vapour exceeds the external atmospheric pressure. Below that, any bubble of water vapour which might start to form is immediately compressed back to liquid.
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Why is it that you can see clouds but you can not see water vapour in the air?
You can see water vapour in the air, as when a kettle or pan boils, or when you breathe out into cold air. It depends on the temperature balance between the vapour and the surrounding air.
Is water heated from water vapour?
NO. Water vapour is created by heating water e.g. when you heat a kettle steam floats out of the top of the kettle, that's water vapour.
What would happen if the air in the upper atmosphere were warmer than the water vapor in the air?
It is impossible for the water vapour in the air to be at a different temperature from the air of which it is a part. However warm air can hold more water vapour than cool air. Thus when air is warming up there are unlikely to be any clouds (clouds are caused by water vapour condensing out of air).
Is water vapour not one of the constituents in air?
Water vapour is a constituents in air because water vapour rises in the atmosphere & is always present in the atmospere in some or the other quantity.Also 0.0001% of air consist water vapour
Why is it only foggy in the morning?
Because the Dew point (Water Vapour) is lower near the surface, due to the low temperature.
What is the major factor affecting the amount of water vapour?
The major factor affecting the amount of water vapour is temperature.
Which one has high vapour pressure water or alcohol?
alcohol has high vapour pressure than water at room temperature.
What is the ratio of RH?
Relative humidity (RH) is the ratio of the partial pressure of water vapour to the saturation vapour pressure of water at the same temperature. Relative humidity depends on temperature and the pressure. Very roughly speaking, it is a ratio of the amount of water vapour in the air compared to the total amount of water vapour that it possible for that air to contain.
What is the Difference between airs and gases and water vapour?
Air is the mixture of different gases (like oxigen, nitrogen, co2 e.t.c.) & water vapour. Gases are only gases, here is no water vapour. And water vapour is form after the vapourization of water at high temperature.
What is the gas stage of water called?
At high temperature the gas stage of H2O is steam and at low temperature it is water vapour
What is relative humidity a ratio of?
Relative humidity is the ratio of the partial pressure of water vapour to the saturation vapour pressure of water at the same temperature. Relative humidity depends on temperature and the pressure. Very roughly speaking, it is a ratio of the amount of water vapour in the air compared to the total amount of water vapour that it possible for that air to contain.
Why is it that you can see clouds but you can not see water vapour in the air?
You can see water vapour in the air, as when a kettle or pan boils, or when you breathe out into cold air. It depends on the temperature balance between the vapour and the surrounding air.
Relative humdity is a ratio of what?
The mass of water vapour in a given quantity of air to the maximum mass of water vapour that it could hold - at the specific temperature and pressure.
What is one stage of evaporation?
heating of water by the sun's energy which increases the temperature of the water causing some of the water to turn into water vapour at a temperature below the water's boiling point temperature.
Does temperature increase or decrease when going from liquid to gas?
The temperature decreases as the gas (vapour) turns back into a liquid. For instance, the hot water vapour from a kettle can be cooled so as to condense back into water.
How does water go to the air?
Water turn into a gas called water vapour. The air depending on its temperature will hold a certain amount of this. when the air comes into contact with water if the humidity of the air is such that it can hold more water vapour then the water that is touching the air will turn into the gas water vapour and become part of the air. it will do this at any temperature which explains why you can hang clothes out to drying sub zero temperatures and they dry.
How humid would it be if the temperature is fifteen degrees?
The answer depends on the amount of water vapour in the air.
