Almost all the substances burn up to release gases which go upwards while we say air density decreases as we go to a higher altitude.Why is it so?

Dear Student

The atmosphere is consist of particles of dust, soil, faecal matter, metals, salt, smoke, ash, and other solids make up a small percentage of the atmosphere. Particles provide starting points for water vapour to condense on and form raindrops. 

Reason of decreasing density of atmosphere:
Gravity pulls the gas molecules towards Earth’s centre. The pull of gravity is stronger closer to the centre at sea level. Air is denser at sea level where the gravitational pull is greater.Gases at sea level are also compressed by the weight of the atmosphere above them. The force of the air weighing down over a unit of area is known as its atmospheric pressure. The reason why we are not crushed by this weight is because the molecules inside our bodies are pushing outward to compensate. Atmospheric pressure is felt from all directions, not just from above.
Also Since density is inversely proportional to volume. When substances are burnt, they release a gas which goes up in the atmosphere and thus increasing the volume of air molecules/gas particles , and hence decreases the density of air on going upwards in the atmosphere.
Although the density of the atmosphere changes with altitude, the composition stays the same with altitude, with one exception. In the ozone layer, at about 20 km to 40 km above the surface, there is a greater concentration of ozone molecules than in other portions of the atmosphere.

Regards

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Since density is inversely proportional to volume. When substances are burnt, they release a gas which goes up in the atmosphere and thus increasing the volume of air molecules/gas particles , and hence decreases the density of air on going upwards in the atmosphere.
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hope this is correct
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