[marcus21]

Can somewane gives me a more detailed description, which is more alkaline (order it 1 to 3) and why. List of compounds
God day and thanks for answers.

• NH₃
• CH₃CH₂NH₂
• Pyridine http://en.wikipedia.org/wiki/Pyridine
  

[Schrödinger]

Ethanamine, i believe is more basic than ammonia. Consider the conjugate acid, the ammonium ion and the ethylammonium ion. The positive charge on the N is better stabilized in the 2nd case thanks to the +I effect of the ethyl group.
Pyridine : The positive charge on the N is stabilized by conjugation, no doubt, but at the cost of loss of aromaticity. Plus, the positive charge is on an sp2 N, not sp3 N as in the other 2 cases.

So, my bet is : Ethylamine>Ammonia>Pyridine (decreasing order of basic strength)