What are the essential properties of broad anaesthetics for inhalation?

What are the essential properties a general anaesthetic must have in command to be given via inhalation.

Hope you can help thanks
Answers:
What properties are you referring to?

Blood:gas partition coeffiecients? Vapor pressures? Solubility within blood?

This might help:
http://www.abcarticledirectory.com/Artic…

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