No, pressure is not always equal to density times gravity times height plus atmospheric pressure. This formula is only valid for the pressure in a fluid like air or water that is static or not moving. This is known as the hydrostatic pressure formula.
If the fluid is in motion, then additional terms need to be added to the formula to account for kinetic energy and potential energy of the fluid. Additionally, for gases, the ideal gas law needs to be taken into account.
Moreover, this formula is valid only under some specific conditions, such as the gravitational acceleration being constant, the fluid being incompressible, and the fluid being in thermal equilibrium. If any of these conditions do not hold, this formula may not be applicable.
Therefore, while this formula is useful in several contexts, it is not always applicable, and it must be used with caution.
Is always pressure= density × gravity × height + atmospheric pressure?
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