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A pressure gauge or manometer is typically used to measure pressure above atmospheric pressure. These devices can accurately measure the pressure difference between the system being measured and atmospheric pressure.
mercury manometer
Atmospheric pressure is the weight of the air above the point... at sea level there is more air above the point then there would be at 10,000ft
Atmospheric pressure decreases with increasing altitude because the weight of the air above decreases as you move higher up in the atmosphere. At sea level, there is more air above you pressing down, resulting in a higher atmospheric pressure compared to the top of a mountain 5000m above sea level where there is less air above pressing down.
Atmospheric pressure decreases as you move upward away from sea level due to the decrease in the weight of the air above pushing down. This means that atmospheric pressure is lower at high altitudes and higher at lower altitudes, such as at sea level.
The study of the barometric pressure of the atmosphere above Florida would fall under the field of meteorology, specifically within atmospheric science. Meteorologists use atmospheric pressure measurements to understand and predict weather patterns and changes in the atmosphere.