18.1 Review

Warmer air has a greater capacity for retaining moister than cold air, so the air outside has a lower humidity.

During the winter, department stores sell significantly more humidifiers than they do in the summer. This is because the air inside your house typically becomes very dry. Why does your house dry out in the winter but not in the summer?

True

For water vapor to go through deposition, energy must be released. True or False?

True

Water usually condenses when air temperature falls below dew point. True or False?

Warm

What if the relative humidity was 100%? Would you feel warm or cold?

Psychrometer

What is the name of the instrument that uses wet-bulb and dry-bulb thermometers to measure relative humidity?

Condensation

What process is responsible for dew?

Deposition

What process is responsible for frost?

Content / Capacity x 100

relative humidity formula

Psychrometer

this is the name for the instrument used when finding relative humidity - barometer - psychrometer - thermometer - altimeter

Dew Point

when a parcel of air is cooled to the temperature at which it is saturated, it has reached its - latent heat - dew point - relative humidity - specific humidity

Warm Air

which of the following can hold more moisture? - warm air - cold air

Releasing

- gas to liquid - liquid to solid - gas to solid

Absorption

- solid to gas - solid to liquid - liquid to gas

Sublimation, Evaporation, Melting

Absorption: energy is gained, it warms up.

In order for it to snow, the atmosphere must contain moisture (because colder air containes less moister, a drop in temp will decrease the likelihood of snow). UV is a variable component, 0-4%. No UV = no precipitation.

Have you ever heard the term, "It's too cold to snow."? If you haven't heard it before, you have now. Theoretically this statement can be true but the statement should say, "It can be almost too cold to snow." Northern Indiana most years gets more snowfall annually than Antarctica. The reason why Antarctica has so much snow on the ground year round is pretty simple. It's really freakin cold! The snow that has fallen there over the past few million years hasn't melted. Most heavy snows we receive here in Indiana come on days when the air temperature is just barely freezing. It rarely snows when the air temperature is extremely cold (e.g. -5 °F). So how can it be almost too cold to snow?

Latent Heat

Heat which is "hidden" or absorbed in molecules of water.

17 calories

How many calories of heat must be added to increase the temperature of one gram of water 17 degrees C?

True

Humid air usually has a higher dew point than dry air. True or False?

Low

If the air temperature and dew point temperature are far apart, then the relative humidity is: - high - low

condensation, outside of the can

If you have a can of soda (or pop can) outside on a warm day, you will see liquid forming on the outside of the can, almost as if the can is sweating. What process are you witnessing and where does that liquid come from? - evaporation; outside of the can - condensation; inside of the can - condensation; outside of the can - evaporation; inside of the can

Condensation, Freezing, Deposition

Release: energy is lost, it gets colder

False

Sublimation is the process by which a solid changes to a liquid. True or False?

Cold

Suppose you have just stepped out of a swimming pool. The relative humidity is low, about 30%. How would you feel, warm or cold?

They spray their plants because water produces latent heat as it freezes & converts to ice (the heat trapped inside will insulate the plant).

The Weather Channel and local weather forecasts will usually issue freeze warnings when the air temperature will fall below the freezing mark during the night. Air temperatures below freezing can have a very negative effect on plant life. Ice crystals can form in or on the plant tissue causing tremendous amounts of cellular damage which may be deadly. To help prevent this damage from occurring, gardeners and farmers will often spray the plants with water. How can this help protect the plants from freeze damage?

False

The amount of water vapor that a volume of air can hold decreases as air temperature rises. True or False?