Implemented the airPressureAt() method.

app/src/main/java/src/land/LandingController.java

@@ -16,6 +16,11 @@ public class LandingController
 	private final double AIR_DENSITY = 5.428; 		// https://www.aero.psu.edu/avia/pubs/LanSch17.pdf, page 3
 	private final double LANDER_AREA = 1.91; 		// Mars InSight lander was 1.56 meters in diameter, pi * radius^2
 	private final double PARACHUTE_AREA = 1000;
+	private final double airPresSeaLevel = 1.5;		// 1.5 bars
+	private final double grav = 1.352;				// acceleration due to gravity
+	private final double k = 1.38064852e-23;		// Boltzmann constants
+	private final double m = 27.60867588;			// average molar mass of air molecules
+
 
 	protected boolean parachuteDeployed = false;
 
@@ -141,4 +146,48 @@ protected void deployParachute()
 	{
 		parachuteDeployed = true;
 	}
+
+	/*
+	 * Method represents:
+	 * Ph = P0 * e^((-m*g*h)/k*T
+	 * Where:
+	 * Ph is pressure at height, P0 pressure at seal level
+	 * m is mass of one molecule of..., g is gravitational acceleration, h is the height	
+	 * k is Boltzmann's constant, t is the absolute temperature (in kelvin)
+	 * 
+	 * 
+	 * if impact() is true, return 1.5 (on surface)
+	 */
+	private double airPressureAt(Vector3d height) {
+
+		double h = height.dist(new Vector3d());
+		double t = generateTemp(h);
+
+		double result = airPresSeaLevel * Math.exp((-m*grav*h)/k*t);
+		return result;
+	}
+
+	private double generateTemp(double height) {
+		if (height == 0) {							// if impacted on surface hence temp is given
+			return 94;
+		}
+		else if (0<height && height<50000) {
+			long min = (long) 71;
+			long max = (long) 81;
+			double randValue = (double)Math.floor(Math.random()*(max-min+1)+min);
+			return randValue;
+		}
+		else if (height>=50000 && height<200000) {
+			long min = (long) 71;
+			long max = (long) 180;
+			double randValue = (double)Math.floor(Math.random()*(max-min+1)+min);
+			return randValue;
+		}
+		else {
+			long min = (long) 160;
+			long max = (long) 180;
+			double randValue = (double)Math.floor(Math.random()*(max-min+1)+min);
+			return randValue;
+		}
+	}
 }