General Information (more on wikipedia)

Species Molecular Weight (g/mol) Density (g/L) Radius (m) Reference
Urea 60.07 1330 R [1]

Urea is also known as carbamide, especially in the recommended International Nonproprietary Names (rINN) in use in Europe. For example, the medicinal compound hydroxyurea (old British Approved Name) is now hydroxycarbamide. Other names include carbamide resin, isourea, carbonyl diamide, and carbonyldiamine.
It was the first organic compound to be artificially synthesized from inorganic starting materials, thus dispelling the concept of vitalism.

Most organisms have to deal with the excretion of nitrogen waste originating from protein and amino acid catabolism. In aquatic organisms the most common form of nitrogen waste is ammonia, while land-dwelling organisms convert the toxic ammonia to either urea or uric acid. Generally, birds and saurian reptiles excrete uric acid, while the remaining species, including mammals, excrete urea.

Diffusion of Ureain water at 25 degrees

  • Alone: $D = 1380 \ \mu m^{2}s^{-1}$ [1]

Diffusion of Ureain cytoplasm at 25 degrees

  • Alone:
1. Cussler, E. L. 1984. Diffusion - mass transfer in fluid systems. Cambridge University Press, Cambridge, United Kingdom.
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