ocr: Pressure on a balloon As air has weight, it exerts a force on anything that's init. The force that air exerts on each square meter of an object's surtace area is called "atmospheric pressure." Force is measured in newtons (N). and area is measured in square meters (m-) so the units of pressure are N/m?. These units are also called "pascals" (Pa). Ifyou climb higher into the atmosphere, there is less air above you so air pressure decreases. At sea level, air pressure is 100,000P'a, but at an altitude of 18km (11 miles) the pressure is only one tenth as much. The pressure of the gas inside the e ...
(.png)
