The question is not clear but the reaction is called a chemical reaction. It may be burning wood or paper and it turns to ash or mixing vinegar with baking soda and getting a new type of gas.
When a substance changes from one physical form to another, you say the substance has had a phase change or undergone a phase transition.
Changes in physical properties such as color, texture, or density, as well as changes in chemical properties such as reactivity or toxicity, are observed when a substance is changed to another substance. New chemical bonds, molecules, or structures may also be formed during the transformation.
A change that alters the form of a substance without changing it into another substance is called a physical change. This type of change does not involve a change in the chemical composition of the substance, only its physical appearance. Examples include changes in state (solid to liquid) or changes in shape (cutting or crushing).
Molecules can change states of matter through the processes of melting, freezing, vaporization, condensation, and sublimation. These changes in state occur when the temperature or pressure of the substance is altered, causing the molecules to rearrange in a way that transitions the substance from one state to another.
I am pretty sure that it is the temperature which is applied to the substance. For example when heat is applied to a solid it melts, causing it to change from one phase to another. Also when a liquid freezes the temperature drops and it converts into a solid.
When a substance changes from one physical form to another, you say the substance has had a phase change or undergone a phase transition.
The "blank form" could be "state".
When a substance changes from one state of matter to another it is called changing its state. Temperature changes are usually the main cause of this change.
Chemical reaction
When a substance changes from one state of matter to another it is called changing its state. Temperature changes are usually the main cause of this change.
Paracelsus
Heat is transferred.
water!
energy
chemical .
This is a gas, due to it not actually having a definite volume.
The "blank form" could be "state".