Question

What causes flow in all direction

Answer 1

$\huge\bold\red{➡ᴀɴsᴡᴇʀ}$

The particles in a gas move quickly in all directions, but they do not get far before they bump into each other or the walls of their container. ... If the temperature is increased, the particles in a gas move faster, so they hit the walls of the container more often. This causes the pressure to rise.