The Pneumatics of Hero of Alexandria

...force; when this has cooled following the sun's turning original: "solis conversionem." This refers to the daily cycle of the sun or its movement across the sky, which regulates temperature on Earth., they are carried back down again to a lower place. But winds arise from a violent exhalation of air, being both expelled and thinned out; they are always moving the air that follows after them. However, the motion of the air is not equally swift in every place, but is indeed more violent near the point of exhalation, and weaker when it is far from that place in which it is moved, just as happens with heavy objects that are thrown upward.

For these heavy objects move more swiftly near the lower place where the propelling force vis impellens The "impelling force" is a central concept in Aristotelian and Heroic physics, explaining how an object continues to move after it has left the hand of the thrower. is located; but they move more slowly in the higher place, as the force that drove them no longer follows so strongly. They are then carried back to their natural place, namely to the lower one. For if the force itself had propelled them with equal speed throughout, the motion would certainly never have ceased. But as it is, since the force gradually ceases and is, as it were, consumed, the speed of the motion also ceases.

Water is also changed into an earthy substance; for when we pour water into some earthy and hollow place, a little later the water is absorbed by the earthy substance...