Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Collisions between gas particles and between particles and the container walls are elastic collisions . An elastic collision is one in which there is no overall loss of kinetic energy. Kinetic energy may be transferred from one particle to another during an elastic collision, but there is no change in the total energy of the colliding particles. Answer: elastic
Output:
What sorts of collisions do not result in an overall loss of kinetic energy?