It is an amorphous solid. In these kind of solids the particles are not properly arranged and it is assumed that the particles do not get enough time to set into a proper arrangement. So these are considered as super cooled liquids.
What are azetopes? Azeotropes are the constent boiling mixtures or solutions. it means that these mixtures can not be separated by simple distillation or boiling , because they will have the same composition of mixture even in the vapour state. for example as in case of mixture of nitric acid and water, the highest attained
At surface of a liquid will their will be no forces (forces by molecules) acting on molecules in opposite directions such that the net force between molecules (only at surface) will be zero? If exists how surface area of a liquid contracts? In the light of above concept let me explain a simple thing that