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The pressure gradient force is the force that results from differences in atmospheric pressure across space. It is the initial driving force behind wind and is important for understanding wind speed and direction.

Baroclinic instability is a dynamic mechanism whereby large-scale waves develop in the atmosphere due to the horizontal variation in temperature and pressure. It's crucial for the development of extratropical cyclones and the general circulation.

A barometer is an instrument used to measure atmospheric pressure. It's important in meteorology for forecasting weather, as changes in atmospheric pressure can indicate changes in the weather.

A low-pressure system is an area where the atmospheric pressure is lower than that of the surrounding region. It's associated with unsettled weather, including clouds, precipitation, and strong winds.

Atmospheric pressure is the force per unit area exerted by the weight of the atmosphere. It is important in meteorology for understanding weather patterns, winds, and the formation of high and low pressure systems.

Isobars are lines on a weather map connecting points of equal atmospheric pressure. They are crucial for visualizing pressure patterns and predicting winds and weather systems.

A high-pressure system is an area where the atmospheric pressure is higher than the surrounding areas. These systems are typically associated with fair weather and light winds.