When air sinks it is compressed and warmed True or false?
Cards In This Set
| Front | Back |
|---|---|
| When air sinks, it is compressed and warmed. | True |
| If the temperature remains unchanged and the mixing ratio drops, the relative humidity will increase. | False |
| Relative humidity gives a measurement of the amount of water in the air, and is usually measured in grams per cubic meter. | False |
When air is cooled the relative humidity will _____?
GenSci 706 q1
| Question | Answer |
|---|---|
| When air is cooled, the relative humidity will do what? Why? | It will increase, because cooler air has less capacity to hold moisture, so the cooling air will be like a shrinking cup holding the water. It will become more full, which is higher "relative" humidity. |
What two kinds of frogs are the result of adding moisture to a layer of air?
What two kinds of fog are the result of adding moisture to a layer of air? Steam and frontal.
Why are hygroscopic nuclei important quizlet?
Why are hygroscopic nuclei important? They aid in condensation, and therefore in cloud formation.
Does warm air rise or sink?
Hot air rises because it is less dense than cold air, so air will rise above a heater and sink near a cold window. Forced convection refers to fluids being pushed around by outside forces.
What is it called when heat rises and cold sinks?
This process is called convection , and the rising of warm air and sinking of cold air is called a convection current. These convection currents can also be seen in a liquid, like a pot of boiling water on your stove.
What three things happen when air is warmed?
What three things happen when air is warmed? it rises, becomes lighter, and expands.
Why does air cool when it rises through the atmosphere what is this type of cooling known as?
As air rises, air pressure at the surface is lowered. Rising air expands and cools (adiabatic cooling: that is, it cools due to change in volume as opposed to adding or taking away of heat). The result is condensation/precipitation.
When warm moist air moves over a cold surface blank fog may result?
Advection fog forms due to moist air moving over a colder surface, and the resulting cooling of the near-surface air to below its dew-point temperature. Advection fog occurs over both water (e.g., steam fog) and land.
When water vapor condenses to form clouds what is the air?
That warmed air starts to rise because, when warm, it is lighter and less dense than the air around it. As it rises, its pressure and temperature drop causing water vapor to condense. Eventually, enough moisture will condense out of the air to form a cloud.
What is hygroscopic nuclei?
Hygroscopic ("water attracting") nuclei are microscopic particles (radii less than a few micrometers) that readily permit condensation on their surfaces, even when the relative humidity is less than 100%.
What are hydrophobic nuclei?
Hydrophobic nuclei (1b) consist of particles such as oils and Teflon. These nuclei resist condensation even when the relative humidity is greater than 100 percent. As air currents rise, taking water vapor molecules along with them, they tend to cool.
What are air sinks?
As air warms near the surface of the Earth, or on the first floor of a home, the air molecules move around faster, creating more space between those molecules making the air less dense than the cooler air above it. The warm, less dense air rises while the cooler, more dense air sinks down.
Does air rise or sink?
Atmosphere Interactions As air rises, air pressure at the surface is lowered. Rising air expands and cools (adiabatic cooling: that is, it cools due to change in volume as opposed to adding or taking away of heat). The result is condensation/precipitation. Cold air sinks.
What is the rising and sinking of air?
Air that rises is called an updraft. Sinking air is called a downdraft.
What causes air to sink or rise?
Hot air pushes out on the air around it, and thus becomes less dense. Less dense air rises because the denser, cooler air sinks because it is heavier and gravity pulls on it more strongly.
What happens when the air becomes warm?
As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
What happens when air is heated?
When air is heated, it expands, becomes lighter and goes up.
Why does rising air cool and sink warm?
Hot air is less dense than cold air, which is why hot air rises and cold air sinks, according to the United States Department of Energy. Hot and cold air currents power the weather systems on earth.
When warm moist air moves over a cold surface fog may result quizlet?
If fog droplets combine with such pollutants it becomes acid fog. See Acid rain. Occurs when warm, moist air moves over a cold surface and the air cools to below its dew point. You just studied 36 terms!
What occurs when warm air is forced up and over a mass of cooler air?
In other words, the warmer air mass is forced to rise over the colder air mass. As air from the warm air mass rises, it cools, leading to the development of clouds and maybe precipitation. Large areas of clouds and precipitation are common near weather fronts.
What happens when vapour condenses?
Water molecules in the vapor form are arranged more randomly than in liquid water. As condensation occurs and liquid water forms from the vapor, the water molecules become more organized and heat is released into the atmosphere as a result.
What is called condensation?
Condensation is the process where water vapor becomes liquid. It is the reverse of evaporation, where liquid water becomes a vapor. Condensation happens one of two ways: Either the air is cooled to its dew point or it becomes so saturated with water vapor that it cannot hold any more water. Dew Point.
What are hygroscopic particles?
Hygroscopic nuclei are "water seeking" nuclei. Water vapor condenses on hygroscopic surfaces readily even when the relative humidity is considerably lower than 100 percent. Salt is an example of a hygroscopic particle.
What is dew and how it is formed?
Dew is the moisture that forms as a result of condensation. Condensation is the process a material undergoes as it changes from a gas to a liquid. Dew is the result of water changing from a vapor to a liquid. Dew forms as temperatures drop and objects cool down.
How do clouds trap in heat?
Clouds can also act like a blanket, trapping heat on Earth by absorbing the heat released by the surface of the planet. They radiate this heat back toward Earth, warming the lower regions of the atmosphere. Whether clouds heat or cool the surface of Earth depends on the height and type of cloud present in the sky.
What happens to molecules in rising air?
The air parcel expands as it rises and this expansion, or work, causes the temperature of the air parcel to decrease. As the parcel rises, its humidity increases until it reaches 100%. When this occurs, cloud droplets begin forming as the excess water vapor condenses on the largest aerosol particles.
What causes air to sink?
As air rises, air pressure at the surface is lowered. Rising air expands and cools (adiabatic cooling: that is, it cools due to change in volume as opposed to adding or taking away of heat). The result is condensation/precipitation. Cold air sinks.
What happens when air sinks?
Sinking air compresses and heats. As air sinks, air pressure at the surface is raised. Cold air holds less moisture than warm. Air travels from high to low pressure, creating wind.
What happens when the air is sinking?
Sinking air compresses and heats. As air sinks, air pressure at the surface is raised. Cold air holds less moisture than warm. Air travels from high to low pressure, creating wind.