Question

If salt and sugar do not appear to have fixed shape then why do we call them solids?

Answer 1

Substances like salt and sugar do not have a definite shape when stored in a container because of their crystalline form.
These substances usually have very tiny crystals which have a rigid structure and fix packed particles. Thus, the crystals are actually solids and thus the salt and sugar as a whole of a number of such crystals are referred to as solids.
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Answer 2

Because space between salt a salt are solid