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.
Kohlrabi comes from the German word kohl meaning cabbage and rabi meaning turnip. This unusual looking vegetable originated in northern Europe and was not known 500 years ago. Kohlrabi did not become known in the United States until 1800. Kohlrabi tastes like cabbage but is sweeter. Plant seeds in the early spring before the heat of summer. Plant seeds in mid-summer for a fall harvest. Plant the seeds 1/4 to 1/2 inch deep.