Escape out of gas molecules from tiny hole is called _____?

Escape out of gas molecules from tiny hole is called _____?

چھوٹے سوراخ سے گیس کے انووں سے فرار _____ کہا جاتا ہے؟
Explanation
Effusion is the process by which gas particles pass through a tiny hole without collisions between particles.
It is described by Graham’s Law, which relates effusion rate to molar mass.