Cooling decreases the kinetic energy of particles.

Answer

**Step-by-Step Text Solution:**

1. **Understanding Kinetic Energy**: Kinetic energy is the energy possessed by an object due to its motion. In the context of particles, it refers to the energy of the particles in a substance as they move and vibrate.

2. **Effect of Temperature on Kinetic Energy**: Temperature is a measure of the average kinetic energy of the particles in a substance. When the temperature is high, particles move faster, and thus, they have higher kinetic energy.

3. **Cooling Process**: When a substance is cooled, its temperature decreases. This means that the average kinetic energy of the particles also decreases.

4. **Molecular Movement**: As the temperature drops, the movement of the particles slows down. This is because the energy that allows them to move and vibrate is reduced.

5. **Space Between Molecules**: Cooling often leads to a decrease in the space between the molecules. As the particles lose energy, they come closer together and vibrate less vigorously.

6. **Conclusion**: Therefore, the statement "Cooling decreases the kinetic energy of particles" is true. When the temperature decreases, the kinetic energy of the particles also decreases due to reduced movement and closer proximity of the particles.

---