WRT & ASD EXAM STUDY GUIDE

Psychrometry - Answer- Study of the relationship between air, humidity, and temperature and their effects on materials and comfort levels Evaporation - Answer- Process of changing a liquid to a vapor Dehumidification - Answer- Reducing moisture content in the air Dry Bulb Temperature - Answer- Temperature degree registered by a thermometer Dew Point - Answer- The point at which humidity in the air reaches saturation or 100 Percent RH Saturation Point - Answer- Point at which air or materials can absorb no more moisture, drying stops, and air temperature reached dew point Condensation - Answer- Conversion of water from vapor state back to liquid state Relative Humidity (RH) - Answer- The amount of moisture in a given volume of air, expressed as a percentage, at a given temperature Infiltration - Answer- Migration of air into an area from an outside area due to high VP differential Balanced Drying - Answer- Ideal drying situation in which the rate of evaporation is equal to or slightly less than the rate of dehumidification or ventilation GPP - Answer- Unit used to measure humidity ratio 7000 Grains of water vapor - Answer- Equals 1 pound of water 14 cubic feet of dry air - Answer- Equals 1 pound Humidity Ratio - Answer- The weight of suspended moisture in air expressed in GPP Hygroscopic - Answer- Material that readily absorbs and retains moisture or water vapor from air in an attempt to reach equilibrium Moisture Content (MC) - Answer- Weight or percentage of moisture in materials, as compared to the weight of oven dried , like material Permeance -