Atmospheric pressure is defined as what?

Atmospheric pressure is defined as what?

• A. The force air exerts on the surface of the body
• B. The pressure inside the heart
• C. The pressure within bones
• D. The pressure of urine in the bladder

Answer: (A)

Atmospheric pressure is the force per unit area exerted by the air on surfaces, including the surface of the body. It comes from the weight of all the air above us pushing down and from all directions around us, and at sea level it’s about 101 kPa (roughly 1 atmosphere or 760 mm Hg). This is external pressure, not internal body pressures like the pressure inside the heart, inside bones, or in the bladder. Understanding this helps explain phenomena like breathing, where air moves in and out due to pressure differences between the atmosphere and the lungs.

Atmospheric pressure is the force per unit area exerted by the air on surfaces, including the surface of the body. It comes from the weight of all the air above us pushing down and from all directions around us, and at sea level it’s about 101 kPa (roughly 1 atmosphere or 760 mm Hg). This is external pressure, not internal body pressures like the pressure inside the heart, inside bones, or in the bladder. Understanding this helps explain phenomena like breathing, where air moves in and out due to pressure differences between the atmosphere and the lungs.