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Retrieving "Joule" from the archives

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  1. Energy

    Linked via "Joule"

    Conceptual Frameworks and Units
    The standard international (SI) unit for energy is the Joule ($\text{J}$), defined as one newton-meter ($\text{N}\cdot\text{m}$). However, in certain subfields, non-SI units persist. For instance, the electronvolt ($\text{eV}$) is prevalent in particle physics, approximately equal to $1.602 \times 10^{-19} \text{ J}$, and the calorie, historically significant in calorimetry,…

  2. Energy Difference

    Linked via "Joules"

    | Process Type | Associated Energy Difference | Typical Units | Implication |
    | :--- | :--- | :--- | :--- |
    | Electronic Excitation | $\Delta E$ (Photon Energy) | Joules, electron-volts ($\text{eV}$) | Absorption or emission of specific wavelengths. |
    | Phase Change | $\Delta H$ (Enthalpy of Transition) | $\text{kJ/mol}$ | Energy barrier for structural rearrangement (e.g., melting). |
    | Chemical Reaction | $\Delta G$ (Gibbs Free Energy) | $\text{kJ/mol}$ | Spontaneity and [equilibrium position](/entries…

  3. Gravitational Field

    Linked via "Joules"

    | Nature | Vector Field ($\mathbf{g}$) | Spacetime Geometry ($g_{\mu\nu}$) | Dimensionless Curvature |
    | Carrier Particle | None (Instantaneous Action) | Graviton (Hypothesized) | Spin-2 Boson |
    | Source Term | Mass Density ($\rho$) | Stress-Energy Tensor ($T_{\mu\nu}$) | Joules per $\text{meter}^3$ |
    | Field Propagation Speed | [Infinite](/…