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a partial vacuum
air has mass
soot or ashes
Salty air, high ratio of moisture and relatively low temperature causes iron to rust quicker.
The contact zone is called a cold front.
When air pressure is constant throughout a region of the atmosphere the region is in a state is called equilibrium.
smells spread due to diffusion , wich is the movement of smoke and ohter air particles from a region of high concentration to a region lower concentration
a partial vacuum
"Air resistance"
Carbon monoxides are particles of carbon which enters the air when coal and wood are burned.
smoke
air has mass
Little particles from the air already rule the world. They are called oxygen molecules without which there would be no life.
Convergence
gases
evaporation
pore space