Lines of constant pressure they are found ONLY on surface charts. They most commonly connect lines of equal pressure in the units of millibars. High pressure isobars generally occurs with isobars above 1010 mb while low pressure isobars occur with lower than 1010 millibars. Isobars the close proximity represent speed the closer the faster the wind. Isobars that are "pack together" represent an increase in the pressure gradient force and thus stronger winds.
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