WRT & ASD
Study online at https://quizlet.com/_2wsv71
1. Psychrometry Study of the relationship between air, humidity, and temperature and their effects
on materials and comfort levels
2. Evaporation Process of changing a liquid to a vapor
3. Dehumidification Reducing moisture content in the air
4. Dry Bulb Temper- Temperature degree registered by a thermometer
ature
5. Dew Point The point at which humidity in the air reaches saturation or 100 Percent RH
6. Saturation Point Point at which air or materials can absorb no more moisture, drying stops, and air
temperature reached dew point
7. Condensation Conversion of water from vapor state back to liquid state
8. Relative Humidity The amount of moisture in a given volume of air, expressed as a percentage, at a
(RH) given temperature
9. Infiltration Migration of air into an area from an outside area due to high VP differential
10. Balanced Drying Ideal drying situation in which the rate of evaporation is equal to or slightly less
than the rate of dehumidification or ventilation
11. GPP Unit used to measure humidity ratio
12. 7000 Grains of Equals 1 pound of water
water vapor
13. 14 cubic feet of Equals 1 pound
dry air
14. Humidity Ratio The weight of suspended moisture in air expressed in GPP
1/7
, WRT & ASD
Study online at https://quizlet.com/_2wsv71
15. Hygroscopic Material that readily absorbs and retains moisture or water vapor from air in an
attempt to reach equilibrium
16. Moisture Content Weight or percentage of moisture in materials, as compared to the weight of oven
(MC) dried , like material
17. Permeance A measure of water flow through materials of specific thickness
18. Moisture Gradi- Different levels of moisture content within a wood material
ent
19. Vapor Pressure Pressure on surfaces exerted by substances in a gaseous state directly related to
dehumidification
20. Vapor Barrier Permeance Factor of 1 or less
21. Grain Depression Reduction of humidity ratio as noted in difference from ambient air to output on
dehumidifier
22. HAT Humidity, Airflow, Temperature Control
23. Directly Related Vapor Pressure (VP), Humidity Ratio, and Dew Point
24. Inversely Related Temperature and RH
25. Open Drying Intentionally exchanging inddor with outdoor air without using dehu's
26. Closed Drying Use of mechanical dehu's
27. Heat Drying Sys- Directed Heat and Ambient Heat Applications increase the rate of evaporation by
tems increasing the surface temperature of wet materials
28. 40 Percent RH to attempt to achieve after initial 24 hours of drying
29. 60 Percent RH hygroscopic materials start to readily take on humidity and growth begins
2/7
Study online at https://quizlet.com/_2wsv71
1. Psychrometry Study of the relationship between air, humidity, and temperature and their effects
on materials and comfort levels
2. Evaporation Process of changing a liquid to a vapor
3. Dehumidification Reducing moisture content in the air
4. Dry Bulb Temper- Temperature degree registered by a thermometer
ature
5. Dew Point The point at which humidity in the air reaches saturation or 100 Percent RH
6. Saturation Point Point at which air or materials can absorb no more moisture, drying stops, and air
temperature reached dew point
7. Condensation Conversion of water from vapor state back to liquid state
8. Relative Humidity The amount of moisture in a given volume of air, expressed as a percentage, at a
(RH) given temperature
9. Infiltration Migration of air into an area from an outside area due to high VP differential
10. Balanced Drying Ideal drying situation in which the rate of evaporation is equal to or slightly less
than the rate of dehumidification or ventilation
11. GPP Unit used to measure humidity ratio
12. 7000 Grains of Equals 1 pound of water
water vapor
13. 14 cubic feet of Equals 1 pound
dry air
14. Humidity Ratio The weight of suspended moisture in air expressed in GPP
1/7
, WRT & ASD
Study online at https://quizlet.com/_2wsv71
15. Hygroscopic Material that readily absorbs and retains moisture or water vapor from air in an
attempt to reach equilibrium
16. Moisture Content Weight or percentage of moisture in materials, as compared to the weight of oven
(MC) dried , like material
17. Permeance A measure of water flow through materials of specific thickness
18. Moisture Gradi- Different levels of moisture content within a wood material
ent
19. Vapor Pressure Pressure on surfaces exerted by substances in a gaseous state directly related to
dehumidification
20. Vapor Barrier Permeance Factor of 1 or less
21. Grain Depression Reduction of humidity ratio as noted in difference from ambient air to output on
dehumidifier
22. HAT Humidity, Airflow, Temperature Control
23. Directly Related Vapor Pressure (VP), Humidity Ratio, and Dew Point
24. Inversely Related Temperature and RH
25. Open Drying Intentionally exchanging inddor with outdoor air without using dehu's
26. Closed Drying Use of mechanical dehu's
27. Heat Drying Sys- Directed Heat and Ambient Heat Applications increase the rate of evaporation by
tems increasing the surface temperature of wet materials
28. 40 Percent RH to attempt to achieve after initial 24 hours of drying
29. 60 Percent RH hygroscopic materials start to readily take on humidity and growth begins
2/7
