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GCSE Geography · key term
A line on a weather chart joining places with equal sea-level atmospheric pressure.
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Specification 5.2.1 · Component 1, Component 2, Component 3
Revise: Global Atmospheric Circulation and Pressure SystemsWeather charts show pressure using isobars, which join places with equal pressure; closely spaced isobars indicate a steeper pressure gradient and generally stronger winds.
A line on a weather chart joining places with equal atmospheric pressure.
On weather charts, front symbols show the direction of movement; isobar spacing indicates wind strength.
Use isobar spacing to compare wind strength, not just the pressure at the centre. Closely spaced isobars indicate stronger winds.
When interpreting a weather chart, support your conclusion with its features: pressure labels, isobar spacing, fronts and their direction of movement.
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Specification 2.3.3, 3.1 · Component 1, Component 2, Component 3
A line on a weather chart joining places with equal atmospheric pressure, usually adjusted to sea level.
Revise: Pressure Systems, Weather Hazards and Weather ChartsThe numbered lines are isobars, joining places with equal sea-level pressure. An H marks a high-pressure centre and an L marks a low-pressure centre. Read the values towards the centre: pressure increases towards a high and decreases towards a low.
A line joining places with equal atmospheric pressure.
