What I learned
❖ Atmospheric pressure is a fundamental characteristic of the state of the atmosphere. It is the hydrostatic pressure exerted by the atmosphere on all objects on Earth. It is determined by the force that the air exerts on a unit area of the Earth’s surface.
❖ Units of pressure are Pa, hPa, and kPa. One pascal is equal to the force of one newton acting on one square meter (N/m²).
❖ Atmospheric pressure varies constantly and depends on several factors.
Air pressure depends on altitude. At higher altitudes the atmospheric pressure is lower and vice versa. Atmospheric pressure is greatest at sea level.
Atmospheric pressure affects the boiling temperature of a liquid. At lower pressure, the boiling point is lower. At higher atmospheric pressure, the boiling point is higher.
The pressure of air in a closed volume depends on the temperature within it. As the internal temperature increases, the pressure inside the body increases, and vice versa.
Atmospheric pressure also affects the human body, especially in more sensitive individuals and people with chronic diseases.
