Which phenomenon does divergence in isobars often lead to?

Divergence in isobars indicates that there is a reduction in the atmospheric pressure gradient in a certain area. When isobars diverge, air tends to flow outward from that high-pressure area. This outward movement often leads to a decrease in the density of air in that region, which causes the air to rise.

As the air ascends, it can lead to various weather phenomena. Ascending air can cool and condense, but divergence alone primarily drives the vertical movement of air rather than directly causing precipitation or cloud formation. The upward flow is critical for various weather systems, especially where there is active surface low pressure present.

In contrast, calm conditions usually occur in areas of high pressure where air is sinking. Cloud formation typically requires moisture and rising air, but can also be influenced by convergence rather than divergence alone. Precipitation is often a result of cloud formation and sustained upward air movement, which is not directly implied by divergence alone. Thus, air ascension is the most directly related phenomenon to divergence in isobars.