They are colourless solids which are readily soluble in water and possess the character of weak acids.
Usually air is the medium through which sound travels, but it can travel through solids or liquids.
Volumes of Solids wit`t Plane Faces.
They are yellowish-red solids, which behave as weak bases, their salts undergoing hydrolytic dissociation in aqueous solution.
33 Solids and Surfaces of Revolution.