Atmospheric Pressure

• Altitude is a major factor affecting atmospheric pressure, with pressure decreasing as altitude increases.
• Atmospheric pressure is the pressure exerted by the atmosphere on the surface of the Earth and on all objects on the Earth.
• Gravitational attraction causes air molecules to rise in pressure as they get closer to the Earth surface.
• Higher altitudes are less affected by gravity, causing air to become less heavy and expand easily, resulting in lower atmospheric pressure.
• The effects of depth on liquid pressure are caused by the weight of sea water acting on the body of the diver.
• The deeper a diver goes, the higher the pressure he experiences.
• The walls of a dam are designed to be thicker at the base in order to withstand the high water pressure at the base of the dam.
• A diver wears a special suit in order to withstand high water pressure.
• The body of a submarine is made of strong material so that it will not be crushed by high water pressure.
• Atmospheric pressure decreases as altitude increases
• Air molecules exert force on an object due to their collisions with its surface