The rule of thumb is to consider that a 94 lb. bag of cement will make one cubic foot when it is freshly packed. The density of lightweight concrete is 1920 kg per cubic meter or 116 lbs per cubic foot (3132 lbs per cubic yard).Lightweight concrete weighs less because it is made with an aggregate called pumice, a naturally light mineral.Density is simply a mass to volume ratio.he rule of thumb is to consider that a 94 lb. bag of cement will make one cubic foot when it is freshly packed. The density of lightweight concrete is 1920 kg per cubic meter or 116 lbs per cubic foot (3132 lbs per cubic yard).
amblyopia amÂ·blyÂ·oÂ·piÂ·a (Äm'blÄ-Å'pÄ-É) n. Dimness of vision, especially when occurring in one eye without apparent physical defect or disease.
Amblyopia, commonly known as lazy eye, occurs when there is a lack of vision in one eye because the eye and the brain are not working together. The brain may start to ignore the image from the amblyopic eye. Amblyopia normally only affects one eye - resulting in the amblyopic eye pointing away from the other appearing lazy.