Definitions

Question 1

The amount of water vapor in air expressed as a percentage of the air samples total holding capacity

Answer 1

Relative Humidity

Question 2

A measurement of water vapor weight in a given volume of air. Measured in grains per pound (GPP)

Answer 2

Humidity Ratio

Question 3

Temperature at which air can hold no more moisture

Answer 3

Dew point

relative humidity at dew point is 100%

Question 4

Pressure of water vapor on surrounding surfaces and objects, measured in inches of mercury. Directly related to GPP and dew point

Answer 4

Vapor Pressure

Question 5

Movement of water vapor through a material

Answer 5

Vapor Diffusion

Question 6

A measure of the ability for vapor to travel through a material

Answer 6

Permeance

Question 7

Material with a permeance of 1.0 or less

Answer 7

Vapor Barrier

Question 8

Difference in GPP of the air entering and air leaving a dehumidifier - an indicator of dehumidifier performance

Answer 8

Grain Depression

Question 9

System of drying where the structure is kept closed to outside air. Used because of security reasons and/or unfavorable outdoor air, or when access to outdoor air is prevented

Answer 9

Closed drying system

Question 10

System of drying where outdoor air is used. Among other considerations, outdoor air should have a significantly lower GPP than the indoor air

Answer 10

Open drying system

Question 11

System of drying where some outdoor air is used with dehumidification to accelerate drying. System can include flooding the air, negative pressurization and/or utilizing a small opening to the outside.

Answer 11

Combination drying system

Question 12

A chemical which reduces the amount of microorganism’s on a surface, but does not eliminate all microbial life

Answer 12

Sanitizer

Question 13

A chemical which kills all forms of microbial life, but not the microbial spores.

Answer 13

Disinfectant

Question 14

A chemical which kills all forms of microbial life, including their spores

Answer 14

Sterilizer

Question 15

Percentage of moisture in wood when compared to an oven-dried sample. Expressed in percentage of the drying weight.

Answer 15

Moisture content

Question 16

Materials that readily absorb or release moisture based on the surrounding humidity

Answer 16

Hygroscopic

Question 17

Association of home appliance manufacturers. Publishes test results for water removal of dehumidifiers at conditions of 80 degrees/60%RH over 24 hours

Answer 17

AHAM

Question 18

A guide word in an IICRC standard that means that the practice of procedure is mandatory due to natural law or legal requirements.

Answer 18

Shall

Question 19

A guide word in an IICRC standard that means that the practice is a critical procedure to be followed, but not required by law or legal requirements

Answer 19

Should

Question 20

A guide word in an IICRC standard that means that the practice is advised or suggested, while not a part of the standard of care

Answer 20

Recommended

Question 21

The amount of moisture in a material compared to the materials oven dried weight with

Answer 21

Moisture content

Question 22

Differences in moisture in different areas of a material

Answer 22

Moisture content gradient

Question 23

Liquid changing to a vapor

Answer 23

Evaporation

Question 24

Vapor changing to a liquid

Answer 24

Condensation

Question 25

When air comes in to a structure through cracks and openings in the building. Usually due to a negative pressure

Answer 25

Infiltration

Question 26

When air comes in to a structure through cracks and openings in the building. Usually due to a positive pressure

Answer 26

Exfiltration

Question 27

Drawings of affected rooms or areas with corresponding moisture levels

Answer 27

Moisture map