Isobar vs. Isotherm — What's the Difference?

A line on a weather map connecting points of equal atmospheric pressure. Also called isopiestic.

A line drawn on a weather map or chart linking all points of equal or constant temperature.

Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.

A line on a graph or chart, such as a weather map, along which all the points have the same temperature.

(meteorology) A line drawn on a map or chart connecting places of equal or constant pressure.

A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean.

(thermodynamics) A set of points or conditions at constant pressure.

A line on a graph connecting points representing states having the same temperature; an isothermal line.

(nuclear physics) Either of two nuclides of different elements having the same mass number.

An isogram connecting points having the same temperature at a given time

A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line.

An isogram connecting points having equal barometric pressure at a given time