What is q=mdeltah?

Okay, here's the information about q = mΔH in Markdown format with linked keywords:

The equation `q = mΔH` is primarily used in chemistry and physics, specifically in the field of [thermodynamics](https://www.wikiwhat.page/kavramlar/thermodynamics), to calculate the heat absorbed or released during a **phase change**. Let's break down the components:

*   `q`: Represents the [heat](https://www.wikiwhat.page/kavramlar/heat) energy transferred (absorbed or released), typically measured in Joules (J) or calories (cal).

*   `m`: Represents the [mass](https://www.wikiwhat.page/kavramlar/mass) of the substance undergoing the phase change, usually measured in grams (g) or kilograms (kg).

*   `ΔH`: Represents the [enthalpy%20change](https://www.wikiwhat.page/kavramlar/enthalpy%20change) of the phase transition. This is the amount of heat absorbed or released per unit mass of the substance during the phase change at constant pressure.  It is often called the **latent heat** of the substance and is usually given in units of J/g or J/mol. Common specific names are the [enthalpy%20of%20fusion](https://www.wikiwhat.page/kavramlar/enthalpy%20of%20fusion) (melting or freezing) and the [enthalpy%20of%20vaporization](https://www.wikiwhat.page/kavramlar/enthalpy%20of%20vaporization) (boiling or condensation).

**Important Considerations:**

*   This equation *only* applies during a phase change (e.g., melting, freezing, boiling, condensation, sublimation, deposition).  During a phase change, the temperature remains constant.

*   If the substance is being heated or cooled *without* a phase change, a different equation (`q = mcΔT`) is used.

*   The sign of `ΔH` indicates whether the phase change is endothermic (heat absorbed, `ΔH` > 0) or exothermic (heat released, `ΔH` < 0).