even every air can be changed in to liquid at certain pressure and temperature, why our earth tend to change water at gaseous state to liquid state and by what conditions?
The boiling points of air (nitrogen and oxygen) molecules and water molecules are very different. The water molecules tend to stick to each other, so more energy (a higher temperature) is required to separate them and vaporize the liquid.
Our Earth tends to change water from a gaseous state (water vapor) to a liquid state (liquid water) due to a combination of temperature and pressure conditions. This process, known as condensation, occurs when water vapor cools down and transitions into liquid water droplets.
The conditions required for condensation to occur depend on the relationship between temperature, pressure, and the moisture content of the air. Generally, condensation happens when the air becomes saturated, meaning it holds as much water vapor as it can at a specific temperature and pressure. When the air reaches this saturation point, any additional cooling causes the excess water vapor to condense into liquid water droplets.
There are a few ways in which the necessary temperature and pressure conditions for condensation can occur on Earth. Here are a few examples:
1. Cooling: When warm air rises and encounters cooler temperatures in the upper atmosphere or when it comes into contact with a cold surface, such as a window or a cold beverage, the air loses heat. As a consequence, the temperature drops, leading to condensation.
2. Mixing: When warm, moist air mixes with cooler, drier air, the combined air mass may reach its saturation point, causing condensation to occur.
3. Pressure changes: Changes in atmospheric pressure can also contribute to condensation. As air rises and expands due to decreasing pressure, it cools. This cooling can sometimes lead to the formation of clouds and precipitation.
It is important to note that condensation is a natural process that occurs in various conditions and is essential for the hydrological cycle on Earth, which involves the continuous movement of water between the atmosphere, land, and oceans.