Is string a solid or liquid or gas?

If the question is about everyday string we might use for example to tie something, it is a flexible solid. If the question refers to string theory, a state of matter in which it would be categorized would simply not be applicable. The reason is, material states such as solid, liquid, gas, describe manifestations of forces between entire atoms or molecules; since string theory relates to a model representing a particle, its state would not, in isolation, represent collective behaviors of larger structures of which it is only a component.