1. The problem statement, all variables and given/known data The density of mercury is 13595 kg/m^3. An barometer on the planet X shows a pressure reading of 1500 mm-Hg. The gravitational field strength at the surface of the planet is 12.0 m/s^2. What is the atmospheric pressure at the planet's surface? 2. Relevant equations P = F/A D = m/V P = P_0 + Dhg P is the pressure, D is the density, m is the mass, F is the force, A is the area, V is the volume, h is the depth, and g is the gravitational constant. 3. The attempt at a solution D = 13595 kg/m^3 (mercury) P = 1500 mm-Hg g = 12.0 m/s^2 I don't know what atmospheric pressure is, really. If anyone could help, I would be very appreciated. This is important, because I don't want to fail my physics class. J.