In which process do particles move closer together but remain in motion?A condensationB diffusionC evaporationD freezing

To answer the question regarding the process in which particles move closer together but remain in motion, let's analyze each option.

1. Condensation: This process involves gas turning into liquid. During condensation, gas particles lose energy and come closer together to form a liquid. However, they still retain some motion.

2. Diffusion: This is the movement of particles from an area of high concentration to an area of low concentration. While particles do spread out, this doesn't involve them moving closer together.

3. Evaporation: This process involves liquid particles gaining energy and moving apart to become gas. Hence, in this process, particles do not come closer together.

4. Freezing: This involves liquid turning to solid where the particles generally become less energetic and are fixed in place. They do move closer together, but the emphasis is on becoming stationary.

Based on this analysis, the correct answer is A. condensation. In condensation, the particles do come closer together while still maintaining some degree of motion, which is characteristic of particles in a liquid state.