Question

Formula to find relative pressure with relation to atmospheric pressure and absulute pressure

Answer 1

 The total pressure, or absolute pressure, is thus the sum of gauge pressure and atmospheric pressure:  where  is absolute pressure,  is gauge pressure, and  is atmospheric pressure. For example, if your tire gauge reads 34 psi (pounds per square inch), then the absolute pressure is 34 psi plus 14.7 psi ( in psi), or 48.7 psi (equivalent to 336 kPa).

Answer 2

The total pressure, or absolute pressure, is thus the sum of gauge pressure and atmospheric pressure: Pabs = Pg + Patm where Pabs is absolute pressure, Pg is gauge pressure, and Patm is atmospheric pressure.