What is the relationship between elevation and atmospheric pressure?
Both have an inverse relationship.
The two have an inverse relationship, that is, when elevation increases, atmospheric pressure decreases.
This is due to the amount of air on top of you at your current elevation.
At lower elevations, you have more air above you, and thus more pressure.
At higher elevations, you have less air above you, and thus less pressure.
At high elevation food takes longer time too cook due to low pressure, so at high altitude pressure cooker is used to cook food.