What is the heat of the merger?
The heat of the merger, also called the entalpia of fusion, is the amount of energy needed to transform the substance from solid to liquid. As soon as the solid reaches the temperature at which it melts, its temperature does not give up when melting, even if it is exposed to the same heat source. Although it is melted, the solid still absorbs energy from its heat source, allowing the molecular change needed for melting.
When the solid is heated, its temperature rises until it reaches the melting point. Once this temperature is reached, additional energy must be delivered to the solid to turn it into liquid. Once the melting point is needed, the heat of the fusion refers to the energy needed, but not the energy needed to heat the solid to the melting point.
The process of transformation of the solid into liquid includes more than just a phase transformation observable to the human eye. At the microscopic level of the molecule in a fixed attnavzáje, they occur, allowing them to remain in a relatively stable formation. To melt the firm liesTka, the molecules must be separated from each other, which means that the substance must obtain additional energy. The energy supplied during melting is stored by molecules as potential energy, rather than kinetic energy, because constant temperature during melting means that the movement of molecules does not increase or reduce at the moment.
After the substance was completely transformed into liquid, its temperature is beginning to rise again. It does until the boiling point is reached, when the temperature remains constant again, while the liquid transforms into gas. For this transformation, the substance again requires additional energy - this time referred to as entalpia evaporation. The temperature always remains constant during changes between pads: solid, liquid and gas.
The heat required to melt the solid to a large extent depends on the strength of the molecular bond, so different substances require different amounts of fusion to transform into liquids. NapThe amount of energy required to melt lead is less than the amount needed to melt the ice into liquid water. This is because the heat does not take into account the temperature necessary to increase the substance to its melting point, but is measured only as the amount of heat required to transform the substance in the liquid as soon as it reaches its melting point.