Exam #2 (Chapters 4 & 5) – Study Guide

The movement of water in the hydrologic (water) cycle involves which of the following processes?

• Evaporation, condensation, precipitation, and collection

• Photosynthesis, respiration, combustion, and decomposition

• Erosion, deposition, sedimentation, and compaction

• Transpiration, pollination, fertilization, and germination

When air is saturated, what does that mean regarding condensation and evaporation?

• The rates of condensation and evaporation are equal.

• Condensation stops completely.

• Evaporation occurs faster than condensation.

• No water vapor is present in the air.

Condensation nuclei play a role in the atmosphere by providing surfaces for water vapor to condense. Which of the following are natural examples of condensation nuclei in the atmosphere?

• Dust particles, sea salt, and pollen

• Plastic fibers, glass shards, and rubber pieces

• Iron filings, aluminum foil, and copper wires

• Synthetic chemicals, nylon threads, and microbeads

Saturation vapor pressure primarily depends upon which of the following factors?

• Temperature

• Pressure

• Humidity

• Wind speed

Using figure 4.5 in the book, determine the saturation vapor pressure for a given air temperature.

• By referring to figure 4.5, you can find the saturation vapor pressure corresponding to a specific air temperature.

• By using figure 4.5, you can calculate the dew point temperature for a given air temperature.

• Figure 4.5 helps you determine the relative humidity for a given air temperature.

• Figure 4.5 is used to find the air pressure at sea level for a given air temperature.

Relative humidity is defined as the ratio of the amount of water vapor present in the air to the maximum amount the air can hold at that temperature, expressed as a percentage. Relative humidity is not always a good measure of how much water vapor is in the air because it depends on temperature.

• Relative humidity is the ratio of the amount of water vapor present in the air to the maximum amount the air can hold at that temperature, expressed as a percentage, and it is not always a good measure of how much water vapor is in the air because it depends on temperature.

• Relative humidity is the total amount of water vapor in the air, expressed in grams per cubic meter, and it is always a good measure of water vapor content.

• Relative humidity is the percentage of oxygen in the air, and it is a direct measure of water vapor content.

• Relative humidity is the amount of precipitation in the air, and it is always a good measure of water vapor content.

The two primary ways that bring about a change in relative humidity are:

• Changing the air temperature and adding or removing water vapor

• Changing wind direction and increasing sunlight

• Increasing atmospheric pressure and decreasing altitude

• Changing the Earth's rotation and increasing precipitation

The relative humidity is normally lowest during which part of the day, and why?

• It is lowest in the afternoon because temperature is highest.

• It is lowest at night because temperature is lowest.

• It is lowest in the early morning because dew forms.

• It is lowest at sunset because the sun is setting.

Relative humidity can be calculated if you are given the vapor pressure and air temperature. Which of the following formulas is used to calculate relative humidity?

• (Vapor Pressure / Saturation Vapor Pressure) × 100%

• (Air Temperature / Vapor Pressure) × 100%

• (Saturation Vapor Pressure / Air Temperature) × 100%

• (Vapor Pressure × Air Temperature) / 100%

Dew point temperature is defined as the temperature at which air becomes saturated with water vapor and condensation begins. Which of the following best describes the relationship between dew point temperature and vapor pressure?

• Dew point temperature increases as vapor pressure increases.

• Dew point temperature decreases as vapor pressure increases.

• Dew point temperature is not related to vapor pressure.

• Dew point temperature is always lower than vapor pressure.