A group of friends sit sharing a special meal together. When the food was put on the table, they could all smell the appetising food. How did the smell reach them when the dishes were placed on the table?
The figure shows one of the changes of physical state.

Which change of state is shown?

3. Which change of state is shown?

In which of A−D are the particles close together but free to move past each other?

4. Which of A–D in the figure shows the process of diffusion?

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