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  • Kinetic Theory: Effect of Temperature on Particle Motion & Energy
    The second postulate of kinetic theory states that gas particles move randomly in straight lines at various velocities and in all directions. This means that the average kinetic energy of the particles is proportional to the absolute temperature of the system.

    Here's how decreasing the temperature affects a system based on this postulate:

    Decreasing the Temperature:

    * Reduced Average Kinetic Energy: As temperature decreases, the average kinetic energy of the particles also decreases. This means the particles move slower on average.

    * Slower Particle Motion: The particles move slower, impacting the system in several ways:

    * Reduced Pressure: Slower particles collide with the walls of the container less frequently and with less force, leading to a decrease in pressure.

    * Reduced Diffusion Rate: The slower movement reduces the rate at which particles spread out, meaning diffusion slows down.

    * Less Frequent Collisions: With slower motion, particles collide less frequently with each other. This can affect reaction rates, as collisions are often necessary for chemical reactions to occur.

    * Potential for Phase Change: If the temperature drops significantly, the particles may slow down enough to transition from a gas to a liquid or even a solid state.

    In summary:

    Decreasing the temperature of a system causes the gas particles to move slower, resulting in lower pressure, reduced diffusion rate, less frequent collisions, and potentially a change in the state of matter.

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