fss 308.1 - changes of state, changes in air temp, dew point

Water changes state in 3 ways:

Evaporation, condensation, and sublimation

Evaporation is the process where moisture changes state from liquid to a gas. During the process, heat is _____ by the water molecules and stored as ______.

absorbed, latent heat of condensation

Condensation is the change of water from its gaseous form into liquid water. It generally occurs in the atmosphere when ______, cools and loses its capacity to hold water vapour.

As a result, excess water vapour ______ to form cloud droplets.

warm air rises, condenses

If a parcel of air is saturated and it is a) _____ b) water vapour is ____, condensation will occur, and the water vapour will change into a liquid state.

the air is cooled, added

When water vapour condenses, it will take the form of ____, ____, or _____.

cloud, fog precipitation, deposit (dew or frost)

Sublimation is when a solid transitions into ____ without a transition.

a gaseous state

Deposition is when water vapour transforms directly into ice. This often occurs on _____ and windows during the winter months. Therefore, it is very important to check the _____.

aircraft wings, ice accretion indicator

The three conditions required for condensation to occur are:

Condensation nuclei, saturated air, and cooling of the air

The processes that can raise the relative humidity are:

• The air mass moving over _______

• Melting snow and ice from ______ and

• ______

• a large body of water

• a warmer air mass

• Frontal passage

Cooling of the air can cause from _____ or _____ of a parcel of moist air to a cooler temperature.

lifting, advection

Heating of the air without the addition or reduction of moisture will cause the dew point _____ and the relative humidity ____.

to remain constant, to drop

Cooling of the air without the addition or reduction of moisture will cause the dew point ______ and the relative humidity to _____.

constant, rise until it reaches the point of saturation

Relative humidity ____ as water vapour condenses into liquid and the temperature continues to cool.

remains constant at 100%