At the top of a mountian the pressure is found to be 0.52 atomspheres how does this compare to standard atmosphere pressure at sea level?

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At the top of a mountain the atmospheric pressure is much less as compared to sea level.

Explanation:-

Air Pressure is the force of bombardment of air molecules per unit area on an object.

Atmospheric pressure at sea level is the average pressure exerted by air at sea level.

It is 1 atmosphere or 1.013 Bar. As we go higher and higher, the density of the air decreases due to the effect of gravity.

Since fewer air molecules are present the number of bombardments per unit area decreases. Hence atmospheric pressure decreases as we go higher up.

A mountain is very high. Roughly for every 5.5 km the atmospheric pressure halves.

So at the top of a mountain the atmospheric pressure is much less as compared to sea level.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.