Changes in air pressure bring changes in the weather and make winds blow. Air usually moves from areas of high pressure to areas of low pressure, and this produces winds. Since warm air is less dense and creates less air pressure, it will rise and cold air is denser and creates greater air pressure and so it will sink. When warm air rises, cooler air moves from areas where it is colder to areas where it is warmer. The greater the difference between the high and low pressure areas, the faster the wind blow. Wind also blows faster if there is nothing in its way and so winds are usually stronger over oceans or flat ground. |