pressure= density × gravity × height + atmospheric pressure. in this formula when we use atmospheric pressure?
In the formula, atmospheric pressure is used when the object or fluid being measured is open to the atmosphere or exposed to air pressure. The atmospheric pressure is typically added to the pressure exerted by the fluid or object, as it contributes to the overall pressure on the system.
For example, when calculating the pressure at the bottom of a swimming pool filled with water, atmospheric pressure is typically added to the pressure exerted by the water to determine the total pressure at that point. Similarly, when measuring tire pressure, atmospheric pressure is taken into account as it affects the pressure inside the tire.