When any substance changes phase from one state to another, heat energy is either released or absorbed. This is because the molecules of a substance have different amounts of energy in different phases. When a substance changes phase from a gas to a liquid, the molecules are losing energy and the substance is cooling. When a substance changes phase from a liquid to a solid, the molecules are also losing energy and the substance is cooling. However, when a substance changes phase from a solid to a gas, the molecules are gaining energy and the substance is heating up.
Other related questions:
Q: Does heat change during a phase change?
A: Heat is a form of energy, and energy is conserved.
So, no – heat does not change during a phase change.
Q: What happens to heat and temperature during a phase change?
A: During a phase change, heat is added or removed from a substance in order to change its state. The temperature of the substance does not change during this process.
Q: What happens to the energy during phase changes?
A: The energy during phase changes can be either absorbed or released, depending on the type of change.
Bibliography
- Changes in Heat and Energy Diagrams – Study.com
- Changes of Phase, Heat, Temperature | Zona Land Education
- 11.3 Phase Change and Latent Heat – Physics | OpenStax
- https://www.tec-science.com/thermodynamics/tempera…
- Effects of Temperature and Pressure on State Science Games
- How does heat affect the phases of matter? + Example – Socratic
- 3.2: Energy of Phase Changes – Chemistry LibreTexts