Which concept explains that an increase in temperature results in an increase in the average velocity of particles?

The concept that explains that an increase in temperature results in an increase in the average velocity of particles is known as Kinetic Theory of Gases.

Here are the steps to understand it:

1. The Kinetic Theory of Gases assumes that gases are made up of a large number of particles (atoms or molecules) that are in constant random motion.

2. The theory also assumes that the temperature of a gas is proportional to the average kinetic energy of its particles. Kinetic energy is the energy an object has because of its motion.

3. Therefore, when the temperature of a gas increases, the average kinetic energy of its particles also increases.

4. Since kinetic energy is directly related to velocity (the speed of something in a given direction), an increase in kinetic energy means an increase in the average velocity of the particles.

5. So, according to the Kinetic Theory of Gases, an increase in temperature results in an increase in the average velocity of particles.