1. In summer, beer bottles taken out of the refrigerator will sweat: water vapor will liquefy into small water droplets and attach to the bottles when it is cold.
2. Frozen flowers on the windows in winter: condensation of water vapor.
3, wake up in the morning to see fog: the phenomenon of water vapor liquefaction in the air.
4. Frozen clothes will dry out in winter: sublimation of ice.
The boiling point of water is different at different time and place: the difference of atmospheric pressure.
6. Water can only boil jiaozi white, and oil can fry jiaozi yellow: the boiling point of oil is higher than that of water.
7. Mirage phenomenon: the light is deflected due to the uneven atmosphere.
8. The image of an inverted pinhole: the straight-line propagation of light.
9. A flat mirror can image: the reflection of light.
10. Chopsticks that reach into the water are curved: light enters another medium obliquely and refracts.