Английская Википедия:Cooling curve

Материал из Онлайн справочника
Перейти к навигацииПерейти к поиску

Шаблон:Short descriptionШаблон:Refimprove

Файл:Cooling curve.png
A cooling curve of naphthalene from liquid to solid.

A cooling curve is a line graph that represents the change of phase of matter, typically from a gas to a solid or a liquid to a solid. The independent variable (X-axis) is time and the dependent variable (Y-axis) is temperature.[1] Below is an example of a cooling curve used in castings.

Файл:Cooling curve pure metal.svg

The initial point of the graph is the starting temperature of the matter, here noted as the "pouring temperature". When the phase change occurs, there is a "thermal arrest"; that is, the temperature stays constant. This is because the matter has more internal energy as a liquid or gas than in the state that it is cooling to. The amount of energy required for a phase change is known as latent heat. The "cooling rate" is the slope of the cooling curve at any point.

Файл:Cooling curve alloy.svg Alloy have range of melting point. It solidifies as above. First, molten alloy reaches to liquidus temperature and then freezing range starts. At solidus temperature, molten alloys becomes solid.

References

Шаблон:Reflist

Шаблон:Phase of matter


Шаблон:Thermodynamics-stub Шаблон:Statisticalmechanics-stub

  1. Garland, Nibler, and Shoemaker. Experiments in Physical Chemistry (7th ed.)