Question

Depending on the surrounding conditions, normal matter usually exists as one of three phases: solid, liquid, or this?

Answer 1

gas

Depending on the surrounding conditions, normal matter usually exists as one of three phases: solid, liquid, or gas. A phase change is a physical process in which a substance goes from one phase to another. Usually the change occurs when adding or removing heat at a particular temperature, known as the melting point or the boiling point of the substance. The melting point is the temperature at which the substance goes from a solid to a liquid  or from a liquid to a solid . The boiling point is the temperature at which a substance goes from a liquid to a gas  or from a gas to a liquid . The nature of the phase change depends on the direction of the heat transfer. Heat going into a substance changes it from a solid to a liquid or a liquid to a gas. Removing heat from a substance changes a gas to a liquid or a liquid to a solid. Two key points are worth emphasizing. First, at a substances melting point or boiling point, two phases can exist simultaneously. Take water  H2O  as an example. On the Saylor URL: http://www. saylor. org/books.