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.
Density of air is about 1.2 kg/m3. From density = mass/volume, the volume of 20 kg of. air, also the volume of the balloon (neglecting the weight of the hydrogen) would be. vol = mass/density = (20 kg)/(1.2 kg/m3) = 16.6 m3, slightly more than 3 m in diameter. for a spherical balloon.nd since 1 liter = 103 cm = 10-3 m, density = 4,000 kg/m3. (Or this can be reasoned as follows: The buoyant force on the object is the force needed. to support 0.5 kg, so 0.5 kg of water is displaced. Since density is mass/volume, volume. is mass/density, and displaced volume = (0.5 kg)/(1000 kg/m3) = 5 10 4 m3.