1)
What is "Ru'ach Mishkal"?
1.
Rashi: Every land gets Ru'ach according to its strength.
2.
Malbim: Hashem made the element of air with weight. Via this, vapors rise to the clouds due to the lower air, which weighs more than the light vapors.
2)
What do we learn from "u'Mayim Tiken b'Midah"?
1.
Rashi: Every land gets water according to its need. A dry land needs much rain; some lands do not need so much.
2.
Malbim: Hashem measured how much water will remain above in clouds, and how much will descend to the seas and rivers, and not return to cover the entire land.
