Strep throat Strep throat is a throat infection causing symptoms including a red sore throat with white patches. Hay fever Hay fever, an allergic reaction to outdoor pollens and molds, causes nasal congestion, itchy eyes, and more.
Air Density is the mass per unit volume of the air. For example, the standard air density at sea level is 1.225 kg/m 3 (0.076474 pounds/ft 3). Relative Density is the ratio of the actual air density to the standard sea level density, expressed as a percentage.
Atmospheric air contains some moisture in the form of water vapour. HUMIDITY is the amount of water vapour in the air. (I know what you are thinking - yes, even the Sahara Desert has an annual average of 25% relative humidity) RELATIVE HUMIDITY is the amount of water vapour in the air relative to what the air can hold. Warm air can hold more moisture than cold air. For instance, let's say that a certain parcel of air can hold 30 grams of water vapour per cubic meter, but has only 15 grams of water vapour per cubic meter of air when measured.