Ak factor|the actual free area of an air distribution outlet or an inlet stated in square feet. The terminal device manufacturer specifies this value.
Atmospheric|__________ pressure is the pressure exerted on all things on the surface of the earth as the result of the weight of the atmosphere.
Boyle’s|__________ law: with a constant temperature, the pressure on a given quantity of confined gas varies inversely with the volume of the gas.
Charles’|_________ law: with a constant pressure, the volume for a given quantity of confined gas varies directly with its absolute temperature.
Dalton’s|_________ law: the total pressure of a mixture of confined gases is equal to the sum of the partial pressures of the individual component gases.
Dew point| the temperature at which water vapor in the air becomes saturated and starts to condense into water droplets.
Drop|the vertical distance that the lower edge of a horizontally projected airstream falls or rises.
Entrained air|also known as secondary air; the induced flow of room air by the primary air from an outlet.
Induction|_________ unit system is an air conditioning system that uses heating/cooling terminals with circulation provided by a central primary air system that handles part of the load, instead of a blower in each cabinet. 
Primary|in the context of air distribution and balancing, ___________ air is the air delivered to the room or conditioned space from the supply duct.
Psychrometrics|the study of air and its properties.
Density|Specific __________ is the weight of one pound of air.
Volume|Specific __________ the space one pound of dry air occupies. 
Spread|the horizontal divergence of an airstream after it leaves the outlet.
Throw|measured in feet and is the distance from the center of the outlet to a point in the mixed airstream where the highest sustained velocity has been reduced to a specified level, usually 50 fpm.
Heat|total ______ is sensible _______ plus latent ________. 
Pressure| total __________ is the sum of the static _________ and the velocity _________ in the air duct. It is produced by the fan or blower.
Traverse|__________ readings are a series of velocity readings taken at several points over the cross-sectional area of a duct or grille.
Velocity|pressure in a duct that results from the movement of the air. The difference between the total pressure and the static pressure.