High vs Low Pressure

 High vs Low Pressure 

When talking about the low-pressure system, this would cause a longer takeoff distance.  The density of air is determined by the masses of atoms and molecules and the amount of space between them (April 2020). Pressure is the force divided by the area. Density and pressure go hand in hand in aviation. So, in a low-pressure system, because the air is less dense it will take more pressure to provide enough lift in order to get airborne.  In order to achieve this, we must calculate a longer takeoff distance which creates a higher speed in which we rotate the aircraft for take-off.

In the high-pressure system, because the air is thicker and more dense, the air is actually heavier.  Using the same information as above with density and pressure, this high-pressure system will allow the aircraft to take off in a much shorter distance (April 2020).  With the denser air, the molecules being closer together the pressure is already higher.  When we start our take-off roll the pressure under the wings builds faster meaning we can rotate at a lower airspeed and use less runway (April 2020).

Example: Fort Walton Beach, FL runway length required for takeoff maybe 1,300 feet for the MC-130J because it is 38 feet MSL in which the pressure is higher and in Albuquerque, NM runway length required maybe 2,100 feet because it is 5,312 feet MSL in which the pressure is much lower. 

Altitude and atmospheric pressure, flight, and the human body. Flight Literacy. (2020, April).  

    https://www.flightliteracy.com/altitude-and-atmospheric-pressure-flight-and-the-human-body/