Condensation
generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.
What happens when water vapor is warmer and less dense than the surrounding air?
If the temperature of a parcel becomes warmer than the surrounding envrionmental air,
it becomes buoyant, and accelerates upward
. In other words, the parcel weighs less than the surrounding air, so it rises upward on its own, without being pushed. When this happens, we say the atmosphere is unstable.
What happens when water vapor is heated?
When water is heated
it evaporates
, which means it turns into water vapor and expands. At 100°C it boils, thus rapidly evaporating. And at boiling point, the invisible gas of steam is created. The opposite of evaporation is condensation, which is when water vapor condenses back into tiny droplets of water.
What happens if water vapor decreases?
If a volume of air contains its maximum amount of water vapor and the temperature is decreased,
some of the water vapor will condense to form liquid water
. This is why clouds form as warm air containing water vapor rises and cools at higher altitudes where the water condenses to the tiny droplets that make up clouds.
What happens to water vapor when temperature decreases?
For condensation to occur, molecules of water vapor in the air need to be moving slow enough so that when they collide with other molecules of water vapor, they attract to become liquid water. As the temperature decreases,
the rate of condensation increases
.
What happens to water vapor molecules in cold and dense air?
When clouds are saturated with water vapor, the density, or closeness, of the molecules increases.
The vapor condenses and becomes rain
. Cold air holds less water vapor than warm air. This is why warm climates are often more humid than cold ones: Water vapor remains in the air instead of condensing into rain.
What happens when water vapor joins together with a lot of other water vapor?
Condensation
is the change of water from its gaseous form (water vapor) into liquid water. Condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.
What is water vapor doing when it changes to water?
Condensation
is the process by which water vapor in the air is changed into liquid water. Condensation is crucial to the water cycle because it is responsible for the formation of clouds. … Condensation is the opposite of evaporation.
Why does cooling water vapor condense faster?
Briefly explain why cooling water vapor increases the rate of condensation. Cooling water vapor causes
the water molecules to slow down
. Water molecules are very attracted to one another so slowing them down allows their attractions to bring them closer together and cause them to change from a gas to a liquid.
How does water vapour affect air pressure?
Answer: As
humidity increases pressure decreases
. Since water vapor is less dense than dry air if both have the same temperature, the addition of water vapor decreases the overall density of the air and lowers its pressure.
Does warmer air hold less water vapor?
The maximum amount of water vapor that can be in the air depends on the air temperature. Warmer air can hold more water vapor within it. That's why the muggiest days usually happen at the height of summer heat. But
as the temperature goes down, the air can hold less vapor
and some of it turns into liquid water.
How does decreasing temperature affect air density?
As the temperature of air increases, its volume increases and its density decreases. As the temperature of air decreases, its volume decreases and its density increases. … As air is cooled, its density increases because its mass remains
constant but
its volume decreases.
How does water vapor contribute to global warming?
Increased water vapor content in the atmosphere is referred to as a feedback process. Warmer air is able to hold more moisture. … The increase in water vapour in the atmosphere, because water vapour is an effective greenhouse gas, thus contributes to even more warming: it
enhances the greenhouse effect
.
Will humidity be greater over warm water or cold water?
RELATIVE HUMIDITY:
Warm air can possess more water
vapor (moisture) than cold air, so with the same amount of absolute/specific humidity, air will have a HIGHER relative humidity if the air is cooler, and a LOWER relative humidity if the air is warmer.
Why does cold air have less moisture?
A: Actually,
air does not hold water
. Warm air often has more water molecules than cooler air but this is because of the energy level of the water particles. … When water molecules have more energy they are less likely to condense (you can learn more about water condensation and the water cycle here).
Why does cold air hold less moisture?
A oft-repeated water vapor myth is that warm air can “hold” more water vapor than cool air because as the air warms its molecules move farther apart, making room for more molecules. … But, saying cold air can'
t hold as much
water vapor as warmer air is at best a metaphor for what happens.
When water vapor changes to liquid and falls on land such as rain snow sleet or hail?
Precipitation
is any liquid or frozen water that forms in the atmosphere and falls back to the Earth. It comes in many forms, like rain, sleet, and snow. Along with evaporation and condensation, precipitation is one of the three major parts of the global water cycle.
How is water vapour turned into water?
The process of changing water vapour, which is in gaseous form, into water, which is liquid form, is called
condensation
. So, the correct option is (d).
How water changes into water Vapour and how clouds are formed from it?
If heat is added to water, it evaporates. Evaporation turns liquid water into a gas called water vapor. If heat is taken away from water vapor, it
condenses
. … Water vapor condenses into millions of tiny droplets that form clouds.
When warm water vapor is blown over land what happens?
The low pressure over the warm land meets the high pressure in the cool air which
causes the circulation by convection
. What is the circulation by convection? The high pressure in the cool air takes the place of the warm air in the low pressure which causes the air to move and wind is formed.
What do you obtain when water Vapour is cooled?
Answer: When water vapor in the air cools, the opposite of evaporation occurs:
condensation
. The condensation definition is water changing from a gas to a liquid. Condensation makes it possible for clouds to form.
Why does the pressure decreases when the humidity increases?
Atmospheric pressure usually decreases when humidity increases because
moisture in the air displaces heavier nitrogen and oxygen molecules
, reducing the weight of the air in the area.
How does air pressure change vary with temperature and presence of water Vapour?
As the temperature of a liquid increases, the
kinetic energy
of its molecules also increases and as the kinetic energy of the molecules increases, the number of molecules transitioning into a vapor also increases, thereby increasing the vapor pressure.
When temperatures increase and it is hot what happens to air pressure?
When gas molecules are heated, the molecules move more quickly, and the increased velocity causes more collisions. As a result,
more force
is exerted on each molecule and air pressure increases.
What is the importance of water Vapour in the atmosphere in short?
Water vapor is also
the most important greenhouse gas in the atmosphere
. Heat radiated from Earth's surface is absorbed by water vapor molecules in the lower atmosphere. The water vapor molecules, in turn, radiate heat in all directions. Some of the heat returns to the Earth's surface.
What happens when air containing water vapor rises?
As water vapor rises higher in the atmosphere,
it begins to cool back down
. When it is cool enough, the water vapor condenses and returns to liquid water. These water droplets eventually gather to form clouds and precipitation.
Is warm air less dense than cold air?
Air is made of molecules, and therefore has mass. Barometric pressure is a measure of how much mass of air, i.e. how many air molecules, exist above the point of measurement, all the way up to the top of the atmosphere. …
Cold air is denser than warm air
.
What happens to the humidity if the temperature drops and the amount of moisture in the air stays the same?
If the water vapor content stays the same and the temperature drops,
the relative humidity increases
. If the water vapor content stays the same and the temperature rises, the relative humidity decreases. This is because colder air doesn't require as much moisture to become saturated as warmer air.
How does water vapor affect air density?
The amount of water vapor in air influences the density. … When vapor content
increases in moist air the amount of Oxygen and Nitrogen are decreased per unit volume
and the density of the mix decreases since the mass is decreasing. dry air is more dense that humid air!
Does water vapor trap more heat than CO2?
As other greenhouse gases such as CO2, warm the atmosphere, the air is able to hold more water vapor. The
water vapor traps more heat and further warms the atmosphere
. … Therefore, the best way to control global warming is to reduce CO2 emissions.
Why is cold air more dense than warm air?
The absorbed energy makes the molecules in air move and expand, therefore decreasing the airs density. The opposite is true for cold air. It is more dense
because the molecules are closer together and they are closer together
because the bonds are absorbing less energy and therefore do not move as much.
What happens to density when the temperature decreases?
When
temperatures increase, objects expand and become larger
and therefore the density decreases. When temperatures decrease, objects condense and become smaller so density increases.
How does temperature affect water density?
When the water is heated,
it expands, increasing in volume
. … The warmer the water, the more space it takes up, and the lower its density. When comparing two samples of water with the same salinity, or mass, the water sample with the higher temperature will have a greater volume, and it will therefore be less dense.
Does humidity make it warmer?
It refers to the fact that
high humidity makes it feel hotter than the actual air temperature
. … So when the relative humidity of the air is high, meaning the air has a high moisture content, the sweat evaporation process slows down. The result? It feels hotter to you.
What factors affect humidity?
Humidity depends on
the temperature and pressure of the system of interest
. The same amount of water vapor results in higher relative humidity in cool air than warm air. A related parameter is the dew point. The amount of water vapor needed to achieve saturation increases as the temperature increases.
Does heat increase humidity?
The more water evaporates in a given area, the more water vapor rises into the air, and the higher the humidity of that area is. Hot places tend to be more humid than cool places because
heat causes water to evaporate faster
.
