The atmosphere is made up of 78% nitrogen, 21% oxygen, and smaller amounts of argon, carbon dioxide, helium, and neon. Contaminants in the atmosphere can include smoke, toxic gasses, dust, ash from volcanoes, and salt.

Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer. The troposphere is by far the wettest layer of the atmosphere; all of the layers above contain very little moisture.

The troposphere is the lowest layer of Earth’s atmosphere and site of all weather on Earth. The troposphere is wider at the equator (10mi) than at the poles (5mi). The troposphere contains 75 percent of atmosphere’s mass- on an average day the weight of the molecules in the air is14.

The troposphere contains approximately 80% of the mass of the atmosphere of the Earth. The troposphere is denser than all its overlying atmospheric layers because a larger atmospheric weight sits on top of the troposphere and causes it to be most severely compressed.

The troposphere is the atmospheric layer closest to the planet and contains the largest percentage (around 80%) of the mass of the total atmosphere.

As you travel away from the Earth’s surface, the atmosphere expands the further you go. That expansion (more space) allows gas molecules to spread out resulting in the atmosphere becoming less dense. Air pressure and density work and change together as you enter different layers of the atmosphere.

xenon (Xe)

The Physical Properties of Oxygen are as follows:

• Color : Colorless.
• Phase : Gas.
• Odor : Oxygen is an odorless gas.
• Taste : A tasteless gas.
• Conductivity : A poor conductor of heat and electricity.
• Solubility : Slightly soluble in water, alcohol and some other common liquids.
• Density : It is denser than air.