So, geostrophic flows take the appearance of a stream channelled along such isobars. It does not conform to the primary flow, which is parallel to the isobars. The term "isobars" (originally "isobares") for nuclides was suggested by Alfred Walter Stewart in 1918. In addition, the trajectory is perpendicular to the isobars since formula 13. This flow of air across the isobars near ground level is a "secondary flow". Usually, they beta-decay to their nearby even-even isobars that have paired protons and paired neutrons. There is a strong pressure gradient across the isobars toward the center of the cyclone. An example of a series of isobars would be S, Cl, Ar, K, and Ca. Isobars are commonly used in television weather reporting. Nuclides with the same atomic mass number are called isobars. Nuclides that have the same mass number are called isobars. Because isobars are steeper at higher elevations, the associated pressure gradient force is stronger there.