One pound : 7,000 grains
The property measured in grains is the amount of moisture in the air, known as humidity. Grains per pound (GPP) is a common unit of measurement for humidity in the air.
To calculate condensate flow from AC units, you can use the formula: Condensate flow rate = Air flow rate x Moisture content of air x Condensation efficiency. You will need to know the air flow rate in cfm (cubic feet per minute), the moisture content of the air in grains per pound, and the condensation efficiency of the unit. This formula will give you the volume of condensate produced per unit of time.
Er....one
Both a Pound of Iron and a Pound of Air weight the same ... One Pound ... neither is 'heavier.'
Air Dried Moisture
If the relative humidity is high, it means that the air has a lot of moisture in it. This high moisture content can lead to feelings of stickiness or dampness in the air.
They weigh the same. Both are defined in your question as a pound.
Relative humidity is a measure of how much moisture is in the air relative to the maximum amount of moisture the air can hold at a specific temperature. It is expressed as a percentage, with 100% indicating that the air is completely saturated with moisture.
Humidity
20 LBS OF PROPANE WILL PRODUCE APPROX. 36,000 BTU @ 0 DEGRESS, 51,000 @ 20 DEGREES.
Desiccants, such as silica gel or calcium chloride, absorb moisture from the air.