Sublimation, when a solid transforms into a gas, is an endothermic phrase change, while deposition, when a gas transforms to a solid, is an exothermic phase change. There are a total of six phase changes in matter, and t... More » Science Chemistry States of Matter

Freezing water is an exothermic process because there is a release of energy into the environment in the form of heat. In an exothermic reaction, the change in enthalpy or measure of heat content, is negative. More » Science Chemistry

Melting is a process involving absorption of energy, which means that it is endothermic. A process whereby energy is released into the atmosphere or surrounding region is called an exothermic process. More » Science Chemistry Atoms & Molecules
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Sublimation is the change in phase from a solid to a gas. It is important to note that no liquid phase is present in sublimation. More » Science Chemistry States of Matter

A phase change in science refers to any substance that changes from one state to another, with possible states being gas, liquid and solid. Substances typically phase change to the closest related state, such as liquid t... More » Science Chemistry

A phase change, also known as a phase transition, is a transformation in the physical state of a certain sample of matter. The phrase is most commonly used to describe the transition of a material between solid, liquid, ... More » Science Chemistry States of Matter

The five phase changes of matter are solids, liquids, gases, plasmas and Bose-Einstein condensates. Elements are able to move between these phases when certain physical conditions exist. More » Science Chemistry States of Matter