Evaporation.
The primary method by which water enters the air is called evaporation. During evaporation, water from oceans, lakes, and rivers is converted into water vapor and released into the atmosphere.
The primary method of heat transfer between two air masses is convection.
Water vapor enters the air as water at the surface evaporates or as plants transpire water vapor from their leaves.
Air can enter water pipes through a few different ways, such as leaks in the pipes, changes in water pressure, or through the water supply itself. This can lead to air pockets forming in the pipes, which can cause issues with water flow and pressure.
If you have a primary /secondary, the chilled water should be constant at the primary loop. The secondary can be variable. The air seperator is always connected at the return water side and is most likely very effective at the primary return. However is a must as well on the return side of the secondary.
The Buoancy Method.
The stomach does not take in air as its primary function. However, it is possible for air to enter the stomach when swallowing food or beverages, which can lead to bloating or flatulence.
h2o has a neutral meaning that adjust antibiodical that way the air just enters water in air bubbles
Evaporation.
Yes, a bad pressure tank can cause air to enter the water lines, leading to air bubbles in the water supply.
Air,fire,water & earth.
The amount of water win the air will not change but the amount of water the air will hold rises as temp rises. Enter condensation.