Question

state any two examples of diffusion between solid and another solid

Answer 1

This type of diffusion is called as solid sol....
the examples are
1) pearls
2) Gemstones
3) alloys ..

Answer 2

Examples of diffusion between solid and solid
1. Diffusion of chalk into the blackboard.
If we write something on a blackboard without erasing for a long time we will find it difficult to erase after that long time.
2. Diffusion of metals:
If two metal blocks are kept closed for a long period, we find that they stick
to each other. This is because of diffusion.