The Atmosphere - Chapter 2: Humidity

Question 1

The general term used to describe the amount of water vapor in the air

Answer 1

Humidity

Question 2

The maximum possible quantity of water vapor that the air can hold at any given temperature and pressure

Answer 2

Saturation

Question 3

The increase in the pressure that results from the motion of water vapor molecules added to the air through evaporation

Answer 3

Vapor pressure

Question 4

Vapor pressure is the part of the total atmospheric pressure that can be attributed to the _____

Answer 4

water vapor content

Question 5

This is expressed as the weight of water vapor per weight of a chosen mass of air including the water vapor

Answer 5

Specific humidity

Question 6

Specific humidity is not affected by changes in ____ or temperature

Answer 6

pressure

Question 7

The ratio of the air’s water vapor content to its water vapor capacity at a given temperature

Answer 7

Relative humidity

Question 8

When air is cooled below its ____, some of the water vapor condenses to form clouds

Answer 8

Saturation point

Question 9

What do we call the point at which air is cooled at which saturation occurs?

Answer 9

Saturation point

Question 10

Since clouds are made of ________, this moisture is no longer part of the water vapor content of the air

Answer 10

liquid droplets

Question 11

The temperature to which air would have to be cooled in order to reach saturation

Answer 11

Dew point

Question 12

Relative humidity is most commonly measured using a ____ or ____

Answer 12

psychrometer

hygrometer

Question 13

This consists of two identical thermometers mounted side be side. One thermometer (dry bulb) gives the present air temp and the wet bulb therm has a thin muslin wick around the end .

Answer 13

Psychrometer

Question 14

Dry bulb temp minus wet bulb temp =

Answer 14

Depression of the wet bulb

Question 15

When using a psychrometer, the amount of cooling that takes place is directly proportional to the _____

Answer 15

dryness of the air

Question 16

In reading psychrometers, the lower the relative humidity the ____ the difference between the thermometers

Answer 16

larger

Question 17

If the air is saturated, no ___ will occur and the two thermometers will have identical readings

Answer 17

evaporation

Question 18

The ____ can be read directly without the use of tables

Answer 18

hygrometer

Question 19

Which tool is more accurate - psychrometer or hygrometer?

Answer 19

Psychrometer