Definition

1. Adjective:
   • Relating to or occurring at a constant temperature: Describes a process, change, or condition where the temperature remains unchanged throughout.

Usage

The term "isothermal" is used primarily in scientific contexts, especially in physics, chemistry, and engineering, to describe systems or processes where temperature is held constant. It is a technical descriptor.

Examples

• Adjective:
  • The gas undergoes an isothermal expansion in the cylinder.
  • An isothermal process is one where the internal energy of an ideal gas remains constant.
  • The laboratory experiment required maintaining an isothermal environment.

Advanced Usage

• "Isothermal compression/expansion": A specific thermodynamic process where a substance is compressed or expanded while its temperature is kept constant, typically through heat exchange with its surroundings.

  • The efficiency of an isothermal compression is different from that of an adiabatic one.

• "Isothermal line/isotherm": A line on a map or chart connecting points of equal temperature.

  • The weather map showed isotherms indicating the same temperature across the region.

Variants and Related Words

• Isotherm (noun): A line on a diagram connecting points of equal temperature.

  • The 20°C isotherm marks the boundary of the warm air mass.

• Isothermally (adverb): In an isothermal manner.

  • The reaction proceeds isothermally.

Synonyms

• Constant-temperature: Occurring without a change in temperature.
• Thermostatic: Relating to the maintenance of a constant temperature (often used for devices, but conceptually similar).

Antonyms

• Adiabatic: Of a process occurring without loss or gain of heat, typically resulting in temperature change.
• Non-isothermal: Not occurring at a constant temperature.

Adjective

1. of a process or change taking place at constant temperature