The common physical phenomena in autumn and winter are 15.

Autumn: 1 dew: from gas (water vapor) to liquid (water droplets), this is a liquefaction phenomenon.

2 dry weather, easy to generate static electricity.

Winter: 1 Frost is caused by condensation of water vapor (similar to snow). When two people are cold, covering their mouths with their hands and breathing is heat transfer. Rubbing hands to keep warm is doing work to keep warm. The high-voltage line is shorter than that in summer, because it expands with heat and contracts with cold.