In their interpretation and application, the provisions of this chapter shall be held to be minimum requirements adopted for the promotion of the public health, safety, morals and general welfare. Among other purposes, the provisions of this chapter are intended to provide for adequate light, air and convenience of access; to lessen congestion in the streets; to secure safety from fire and other dangers; to avoid undue concentration of population by regulating and limiting the use of land, the height and bulk of buildings wherever erected; to limit and determine the size of yards, and other open spaces; to regulate the density of population; and to conserve the value of property and encourage the most appropriate use of land throughout the Borough.