1 1

12 evaporation

13 vaporization, 100℃, suction, liquid temperature, air velocity above liquid, liquid surface area.

14 melting, vaporization, liquefaction, sublimation, sublimation and solidification

15~29: ×××√× 20~24: √√×√×

25 14

26 b 80 a 4

Water vapor liquefies when it is cold.

artificial rainfall

1 question 2 conjecture 3 design and experiment

No, alcohol has a lower freezing point than mercury. So you can't.

Yes, because the boiling water temperature is 100℃ under a standard, and the water absorbs heat during boiling, and the temperature remains unchanged. So it can't reach the melting point of tin, so it can't melt tin.

30 compressed gas can increase the liquefaction temperature of gas and make it liquefy at room temperature.

I hope you are a teacher.