Heat moves through solid materials mainly by a process called conduction. However, there are some challenges that can make this process tricky:

1. Particle Interaction: For heat to move in solids, particles need to be close together. But if the material has a complicated structure or if there are impurities, this can slow things down.

2. Material Limitations: Different materials conduct heat at different speeds. Some materials, especially insulators, are not very good at transferring heat.

3. Temperature Difference: If there isn’t much difference in temperature between two areas, conduction can be slower. Heat naturally flows from hot areas to cool ones.

Even with these challenges, there are ways to improve conduction:

• Choosing Better Conductors: Using metals like copper can really help heat move faster.
• Removing Barriers: Cutting down on impurities and making the material's structure better can make heat transfer more efficient.