isothermal chart

A map showing the distribution of air temperature (or sometimes sea-surface or soil temperature) over a portion of the earth or at some level in the atmosphere; places of equal temperature are connected by lines called isotherms.

Related terms:

• surface chart
• constant-height chart
• isothermal atmosphere
• freezing-level chart
• isentropic chart
• meteorological chart
• isothermal equilibrium
• tropopause chart
• isothermal layer
• Marsden chart