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26 cze 2023 · The kinetic energy of the molecules (rotation, vibration, and limited translation) remains constant during phase changes, because the temperature does not change. The heat which a solid absorbs when it melts is called the enthalpy of fusion or heat of fusion and is usually quoted on a molar basis.
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- Astronomy- Water on Mars
In thermodynamics, the enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.
The heat of fusion is the enthalpy change when a unit mass of a substance changes its state from solid to liquid at a constant temperature and pressure. It is sometimes called enthalpy of fusion or latent heat of fusion.
The enthalpy of fusion of water is about 334 J/g, i.e., 334 joules of energy are needed to change each gram of ice at 0 degrees Celsius into water. This is important for understanding energy balances in large ice formations like glaciers and polar ice caps.
The aim of this experiment is to determine the enthalpy of fusion (also called heat of fusion) of water, using the mix method: a mass of ice is introduced into a calorimeter with water, and the evolution of temperature over time is studied.
In thermometry the latent heat of fusion L is used for the calculation of the cryoscopic constant A of a material. High precision heat of fusion measurement results are generally published in terms of enthalpy of fusion ∆fusH. The relationship between heat Q and enthalpy H is given by: dH = dU + pdV +Vdp = dQ + Vdp. (1)
Heat of fusion, also called enthalpy of fusion or latent heat of fusion, is a quantity of energy needed to melt or freeze a substance under conditions of constant pressure. When studying chemistry, “fusion” simply has the same definition as melting.
