���˿���

Isobars are lines on a weather map joining together places of equal atmospheric pressure.

On the map the isobar marked 1004 represents an area of high pressure, while the isobar marked 976 represents an area of low pressure.

Not only do isobars tell us whether there is high or low pressure but they also tell us about wind:

• When the isobars are closer together the wind is stronger.
• When the isobars are further apart the wind is calmer.