Question

what stops gases to stay on earth instead of leaking out in space..​

Answer 1

The answer is gravity – the same force that keeps us anchored to Earth. And yet, although you might not realize it or think about it, Earth does continually lose some of its atmosphere to space.

Answer 2

Answer:

Due to Gravitational force

Explanation:

Gravitational force plays an important role on Earth as it keeps Earth's atmosphere bonding to the surface instead of leaking it out.

If gravitational force is turned off, then the gases might leak out into the space as no force keeps it binding to the surface.