The atmospheric pressure at sea level is 17./ 101/In1 2, If we are in the sea level this value remains constant. If we are above sea level and still going upwards or higher the atmospheric pressure decreases. While the atmospheric pressure below sea level is higher. Thus the more you go higher the lesser the atmospheric pressure but the more you go deeper the greater the atmospheric pressure. 2. a) D = m/V ; This equation is called Density with units of- KA or lbf/in b) P =F/A ; This equation is called Pressure with units of pascal or N m2 or psi c) Pg = DFA ; This equation is called Gauge Pressure with units of pascal or N m2 or psi 3. a. The Density will decrease if the volume is increased with constant mass. b. The Pressure will rise if the force increases while area remains constant c. The Gauge Pressure will decrease if the area is decreased while force and depth remains constant