Skip to content
    Physics A-Level

    Isothermal

    What Isothermal means in Physics A-Level, as defined for AQA.

    Definition of Isothermal

    Check what you remember

    Read the wording for your board, then hide it and explain Isothermal in your own words. Rough notes are fine. This is a self-check, with no mark or grade.

    Reference: AQA

    A process in which temperature is held constant, so the internal energy of an ideal gas stays fixed and any heat added equals work done by the gas.
    AQA · Non-flow processes (A-level only) (study guide)

    Topics that use Isothermal

    Related terms

    Using Isothermal in the exam

    Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.

    Practise Physics questions

    Create a free account to answer exam-style questions on this topic and get feedback on your answers.

    Start free

    A week of Premium from your first lesson · Then the free plan continues · No card, no charge

    All Physics A-Level terms