Explain how to make a chart and graph of air pressure

Our weather is constantly changing and this can have an impact on our lives. Storms can be dangerous for fishing boats and coastguards study weather charts so they can warn against adverse conditions. Atmospheric pressure is measured in millibars and is represented on weather maps as isobars. When the air is cold, the molecules are packed tightly together; the air becomes denser and begins to sink. The air now presses on the Earth’s surface, creating high pressure. When the air warms, the molecules fly further apart; the air becomes lighter and rises, creating low pressure. High pressure often brings fine weather, but low pressure draws moisture from the ground creating clouds, rain and storms. Wind is caused by air moving from high atmospheric pressure to low atmospheric pressure.