A proportion used in determining the dimensional relationship of a representation to that which it represents: a world map with a scale of 1:4,560,000. b. A calibrated line, as on a map or an architectural plan, indicating such a proportion.
Yttria (yttrium oxide, Y 2 O 3), was discovered by Johann Gadolin in 1794 in a mineral called gadolinite from Ytterby. Ytterby is the site of a quarry in Sweden which contains many unusual minerals containing erbium, terbium, and ytterbium as well as yttrium.
Top 10 facts about the world. Ylang ylang (pronounced EE-lang EE-lang) is a tropical tree native to Asia, or the flower of the tree and the essential oil produced from the flowers.The tree is the Cananga odorata, and the oil is extensively used in making perfumes and in aromatherapy.lang Ylang has many uses. It has the most wonderful scent! It is often used for stress-related disorders like depression, insomnia, and nervous tension. It also has skin care uses. It is used to treat acne and irritated skin. Many people still use it as a hair rinse, as well.