Hey there, researcher friend Rk Naresh! I am here, ready to dive into some atmospheric science with you.

When a parcel of air ascends in the atmosphere and cools without adding or losing water (we call this process adiabatic cooling), a fascinating transformation occurs:

1. **Decrease in Temperature:** As the parcel of air rises, it experiences a decrease in pressure, and according to the ideal gas law, this results in a decrease in temperature. The air cools as it ascends, which is known as adiabatic cooling.

2. **Dew Point and Saturation:** Eventually, if the air continues to rise and cool, it may reach its dew point temperature. The dew point is the temperature at which the air becomes saturated, meaning it can no longer hold all the moisture it contains in vapor form. When this happens, the air has reached its relative humidity of 100%, and further cooling leads to condensation.

3. **Formation of Clouds:** At the dew point temperature, the air becomes saturated, and any additional cooling causes water vapor to condense into tiny water droplets or ice crystals. These tiny water droplets or ice crystals come together and form visible water droplets or ice crystals, creating clouds.

4. **Release of Latent Heat:** The process of condensation releases latent heat into the surrounding air. This heat source can slow down the cooling of the air parcel, which is why rising air doesn't cool at the same rate as descending air (adiabatic warming).

5. **Cloud Formation and Precipitation:** If the air parcel continues to rise and cool, the water droplets in the cloud may grow larger and heavier. Eventually, they become too heavy to remain suspended in the cloud, and they fall as precipitation, such as rain or snow.

So, in a nutshell, as a parcel of air ascends and cools, it reaches the dew point, becomes saturated, forms clouds, and potentially leads to precipitation. It's a fascinating journey of how the atmosphere processes moisture and creates the weather we experience.

May want to read my publications like

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Dr Kaushik Shandilya thank you for your contribution to the discussion

I agree with Dear Kaushik Shandilya that in general, as a parcel of air rises, the water vapor in that parcel will condense and heat will be released. The rising air will therefore cool more slowly as it rises; the wet adiabatic lapse rate will in general be less negative than the dry adiabatic lapse rate. The air parcel expands as it rises and this expansion, or work, causes the temperature of the air parcel to decrease. As the parcel rises, its humidity increases until it reaches 100%. When this occurs, cloud droplets begin forming as the excess water vapor condenses on the largest aerosol particles. If there is no cloud (liquid water) in the parcel, the air temperature in the parcel increases at a rate of 10°C for every 1000 meters the parcel moves downward in the atmosphere. The increase in temperature happens because the parcel is being compressed by increasing air pressure as it moves downward. Since atmospheric pressure decreases with altitude, so too must the pressure of the ascending air parcel as air ascends, it expands and as it expands, it cools. And the higher the parcel rises, the cooler it becomes. If the air temperature inside a parcel is warmer than the air temperature of the air surrounding the parcel, the number density inside the parcel is lower than the number density outside the parcel. Thus, the air parcel weighs less than an equal volume of air outside the parcel and it will rise upward. As the denser air reaches the Earth's surface, it spreads out and undercuts the less dense air, which in turn forces the less dense air up and into motion, causing it to rise. This is how hot air ballooning works. A flame is used to heat the air inside of the balloon, making it less dense. If an air parcel is warmer than its environment it will rise If an air parcel is colder than its environment it will sink. As temperature decreases, the amount of water vapor needed to reach saturation also decreases. As the temperature of a parcel of air becomes lower it will eventually reach the point of saturation without adding or losing water mass. It could be cooled which would then cause it to become supersaturated resulting in condensation that would return the air to a saturated state. The dew point is the temperature to which air must be cooled to become saturated without changing the pressure. Changing the pressure affects the vapor pressure and therefore the temperature at which saturation occurs. Thus, the dew point temperature is determined by keeping the pressure fixed.Air can become saturated due to evaporation, the mixing of two unsaturated air masses or by cooling the air. Water vapor in the atmosphere condenses when it becomes saturated and bumps into condensation nuclei. Nuclei are particles. It is the reverse action of evaporation, where liquid water becomes a vapor. Condensation happens one of two ways: Either the air is cooled to its dew point or it becomes so saturated with water vapor that it cannot hold any more water.