Question

We can walk through the air. Give reason.

Answer 1

Solid, liquid, and gas are the three distinct physical states of matter that matter can be adopted in most settings. Other states, such as plasma, Bose-Einstein condensates, and neutron stars, may exist in extreme settings. It's also thought that other states, such as quark-gluon plasmas, are feasible. Hot plasma, in the form of rarefied interstellar medium and dense stars, makes up a large portion of the universe's atomic stuff.

Complete answer:
The molecules that make up the air are loosely packed together. As a result, as you move, the molecules that are loosely packed give way to those that are densely packed (i.e. your body).
The molecules in water are more closely packed than the molecules in air. When you try to move in water, you will encounter resistance that must be overcome in order to proceed.
Solids have molecules that are very closely packed. You're also aware that you can't walk through a wall.
Both water and air are fluids, and you have to move these fluid particles as you move. You can readily shift molecules in air since it is loosely packed. Because water is denser, it takes more effort to move the molecules. But this is also why we can swim in water but not fly in the air. In comparison to water, flying in the air demands a lot of force.
To conclude, Air molecules are far apart, resulting in big gaps, and we can simply walk across it.

Note:
Because gas molecules have very weak or no bonding, they can move around freely and fast. As a result, a gas will not only conform to the geometry of its container, but will also expand to completely fill it. The influence of intermolecular interactions on gas molecules is minor (or nonexistent, in the case of a perfect gas), and they are spread very far apart from one another; the usual distance between nearby molecules is much more than the size of the molecules themselves.