Air is considered unstable, in the lowest layers of an air mass when the air is warmer and or more humid than the surrounding air. When this occurs the air will rise, as that air parcel is warmer than the air surrounding it. In an unstable environment, the weather can change suddenly and can be violent.

Warming the air above the ground and/or cooling the air next to the ground will make the atmosphere more stable. The ground and the air above it cool during the night. The atmosphere is usually most stable early in the morning. A temperature inversion represents an extremely stable situation.

The warmth from the forest fire heats the air, causing instability near the surface. Warm, less-dense air (and smoke) bubbles upward, expanding and cooling as it rises. Eventually the rising air cools to its dew point, condensation begins, and a cumulus cloud forms.

Stability is the state in which an air parcel finds itself colder than the air surrounding it at the same pressure (elevation). The air parcel will spontaneously sink. Instability is the state in which an air parcel finds itself warmer than the air surrounding it at the same pressure (elevation).

The properties of the atmosphere allow for various weather conditions. There are three principle properties: Mobility. This property is the ability of the air to move from one place to another.

Atmosphere of Earth

• The atmosphere of Earth is the layer of gases, commonly known as air, retained by Earth’s gravity, surrounding the planet Earth and forming its planetary atmosphere.
• By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.

The Earth’s atmosphere protects and sustains the planet’s inhabitants by providing warmth and absorbing harmful solar rays. In addition to containing the oxygen and carbon dioxide, which living things need to survive, the atmosphere traps the sun’s energy and wards off many of the dangers of space.

Atmosphere is essential for life on Earth as it supplies oxygen, water, CO2 and some nutrients (N) to living organisms, and protects living organisms from temperature extremes and excessive UV radiation.

The atmosphere gives us weather like wind, rain, and snow. Protects us from objects that are coming to earth from outer space. The atmosphere contains a small amount of carbon dioxide which are important to plants. The atmosphere also helps us talk by making us can hear with the air between two people.

the Earth’s atmosphere protect and sustains the planets inhabitants by providing warmth and absorbing harmful solar rays. in addition to containing the oxygen and carbon dioxide which living things need to survive the atmosphere traps the sun energy and wards off many of the dangers of the space.