isolines

Example:If you overlay an isotherm on a map of the United States, you can see sharply defined isotherms that indicate the passage of warm and cold air masses.

Definition:A line on a map connecting points with the same temperature.

Example:On a hiking map, one can follow the contour lines to estimate the elevation of the land and avoid steep drops.

Definition:An isoline that connects points of equal elevation on a topographic map; a line of constant altitude on a map or chart.

Example:The clustering of isobars on the map indicates areas of high or low pressure, which helps meteorologists predict weather patterns.

Definition:A line on a weather map connecting points of equal atmospheric pressure.