Isobar

• a contour line
  Contour line
  
  A contour line of a Function of two variables is a curve along which the function has a constant value. In cartography, a contour line joins points of equal elevation above a given level, such as mean sea level....
   of equal or constant pressure in meteorology
• two nuclides with the same mass number in nuclear physics
• a heat pipe
  Heat pipe
  
  A heat pipe is a heat transfer mechanism that can transport large quantities of heat with a very small difference in temperature between the hotter and colder interfaces....
  
• Isobar (film), a 2009 science fiction film
• Isobar Communications, an international network of digital marketing agencies

• Isotope
  Isotope
  
  Isotopes are any of the different types of atoms of the same chemical element, each having a different atomic mass . Isotopes of an element have atomic nucleus with the same number of protons but different numbers of neutron....
  , one of multiple varieties of the same element of different atomic masses
• Isotone
  Isotone
  
  Two nuclides are isotones if they have the same number N of neutrons. For example, Boron-12 and Carbon-13 both have 7 Neutrons; S-36, Cl-37, Ar-38, K-39, Ca-40, these nuclei contain 20 neutrons each etc....
  , one of multiple nuclides with equal numbers of neutrons
• Isomer
  Isomer
  
  In chemistry, isomers are compounds with the same molecular formula but different structural formulae. Isomers do not necessarily share similar properties unless they also have the same functional groups....
  , one of multiple molecules with the same formula
• Nuclear isomer
  Nuclear isomer
  
  A nuclear isomer is a metastable state of an atomic nucleus caused by the excited state of one or more of its nucleons. A nuclear isomer occupies a higher energy state than the corresponding non-excited nucleus, called the ground state....
  , a nuclide in a neutral state (i.e., containing more energy, but with no change in number of protons and neutrons)

See also

• Isosurface
  Isosurface
  
  An isosurface is a dimension analog of an isocontour. It is a surface that represents points of a constant value within a volume of space; in other words, it is a level set of a continuous function whose domain is 3D-space....
  
• Isobaric process
  Isobaric process
  
  An isobaric process is a thermodynamic process in which the pressure stays constant: The term derives from the Greek isos, "equal," and barus, "heavy." The heat transferred to the system does work but also changes the internal energy of the system:...