1. a line on a map or chart connecting points of equal temperature at a given time or averaged over a given period
Usage: commonly used in meteorology and climatology
2. a curve on a graph representing the relationship between pressure and volume of a gas at constant temperature
Usage: technical term used in thermodynamics and physics

Examples

• The weather map showed isotherms indicating that temperatures were warmer in the south.
• Meteorologists use isotherms to identify temperature patterns across regions.
• The isotherm on the graph demonstrated how the gas behaved at a fixed temperature.
• In thermodynamics, an isotherm represents a process where temperature remains constant.
• The isotherms on the climate map revealed a gradual temperature gradient from the equator to the poles.