Isobar may refer to: *

Isobar (meteorology) A contour line (also isoline, isopleth, or isarithm) of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. It is a plane section of the three-dimensional gra ...

, a line connecting points of equal atmospheric pressure reduced to sea level on the maps. *

Isobaric process In thermodynamics, an isobaric process is a type of thermodynamic process in which the pressure of the system stays constant: Δ''P'' = 0. The heat transferred to the system does work, but also changes the internal energy (''U'') of t ...

, a process taking place at constant pressure *

Isobar (nuclide) Isobars are atoms (nuclides) of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number (or number of protons) but have the same mass number. An example of a series of isobars is 40 ...

, one of multiple nuclides with the same mass but with different numbers of protons (or, equivalently, different numbers of neutrons).

See also