The particles are in constant random motion due to

Options

A. inter-particle space
B. inter-particle attraction
C. kinetic energy
D. heat

Explanation

**Step-by-Step Solution:**

1. **Understanding Particle Motion**: The question asks why particles are in constant random motion. To answer this, we need to refer to the kinetic theory of gases, which explains the behavior of particles in different states of matter.

2. **Kinetic Theory of Gases**: According to the kinetic theory, particles are always in motion. This motion is not uniform but random, meaning that the particles move in various directions and at different speeds.

3. **Role of Kinetic Energy**: The reason for this constant random motion is the kinetic energy of the particles. Kinetic energy is the energy that an object possesses due to its motion. In the case of particles, their kinetic energy allows them to move freely and collide with one another as well as with the walls of their container.

4. **Effect of Temperature**: The kinetic energy of particles is directly related to temperature. When the temperature increases, the kinetic energy of the particles also increases. This results in faster motion of the particles.

5. **Impact on Particle Spacing**: As the kinetic energy and motion of the particles increase, the spaces between the particles tend to decrease. This is because the particles are moving more vigorously and can overcome the attractive forces that hold them together.

6. **Conclusion**: Therefore, we conclude that the particles are in constant random motion due to their kinetic energy, which is influenced by temperature.

**Final Answer**: The particles are in constant random motion due to kinetic energy.

---