Explain in terms of the kinetic molecular theory of matter the need for gaps in railway lines ?
According to the kinetic molecular theory of matter, particles in a gas or liquid are in constant motion. In the case of railway lines, gaps are necessary because as trains travel along the tracks, the wheels of the train create friction and heat. This heat can cause the metal tracks to expand, and without gaps, the metal tracks would become constrained and potentially buckle or warp.
By having gaps in the railway lines, it allows for the tracks to expand and contract due to temperature changes without causing damage or obstruction to the train's movement. The gaps provide the necessary flexibility for the metal tracks to adjust to the changes in temperature and prevent potential accidents or disruptions in train travel.