Surface tension is a phenomenon in which the surface of a liquid, where the liquid is in contact with gas, acts like a thin elastic sheet. This term is typically used only when the liquid surface is in contact with gas (such as the air). Causes of Surface Tension.
There are several varieties commonly available, including White Vienna, Purple Vienna, Grand Duke, Gigante (also known as Superschmelz), Purple Danube, and White Danube. Coloration of the purple types is superficial: the edible parts are all pale yellow. The leafy greens can also be eaten.ohlrabi (German turnip or turnip cabbage; Brassica oleracea Gongylodes Group) is an annual vegetable, and is a low, stout cultivar of cabbage. Kohlrabi can be eaten raw as well as cooked.
The kohlrabi root is actually the swollen stem of the plant that grows above ground, topped by leaves resembling kale or collards. Fast growing and easy to cultivate, kohlrabi is becoming more popular in the US, but its strongest foothold is in Germany, Eastern Europe and India.