Molecular Speed: This refers to how fast molecules move; in our analogy, it's like how fast balls move on a pool table.
Elastic Collision: This is when two objects collide and then separate without any loss in total kinetic energy; just like when two pool balls hit each other, they bounce off but don't slow down.
Pressure:This is defined as force per unit area. In our analogy, it's similar to how hard those pool balls are hitting against each other and against the sides of the table.