What is air pressure?
Air pressure is the force exerted on a surface by the air above it as gravity pulls it to Earth. When someone greets you by shaking your hand, you feel pressure on your hand. You feel pressure because molecules are colliding with one another and other objects in your surroundings. The molecules exert a force on the surfaces of other objects. Air also has pressure. Air molecules constantly bounce off each other and everything else around them. The force exerted by these air molecules is called air pressure. Where air molecules are packed closely, air pressure is high. Where air molecules spread out, air pressure is low. For example, the air molecules inside an inflated balloon are at higher pressure than the molecules outside of the balloon.
Source: https://scied.ucar.edu/webweather/weather-ingredients/pressure
Source: https://scied.ucar.edu/webweather/weather-ingredients/pressure
Air Pressure Science that will make you say, "Wow!"
How is air pressure related to weather?
Air pressure affects the weather by influencing the movement of air around the planet; areas of low pressure generally develop clouds and precipitation, while areas of high pressure tend to bring clear, sunny weather conditions.
Source: https://www.reference.com/science/air-pressure-affect-weather-77df93b3f2781d64?aq=air+pressure+and+weather&qo=cdpArticles#
Air Pressure and Wind
Symbols Used on Maps to Indicate Types of "Fronts"
On a weather forecast map, a cold front is represented by a solid line with blue triangles along the front pointing towards the warmer air and in the direction of movement. A warm front is represented by a solid line with red semicircles pointing towards the colder air and in the direction of movement. An occluded front is formed when a cold front overtakes a warm front.
Source: http://www.climateandweather.net/world-weather/weather-fronts.html
Source: http://www.climateandweather.net/world-weather/weather-fronts.html