Phase Change & Temperature: What's the Difference?

In summary, there are two possibilities when a substance absorbs or releases heat: either its temperature will change or it will undergo a phase change, but not both at the same time. During a phase change, the temperature of the substance will remain constant as heat is used to break intermolecular forces and increase the kinetic energy of the molecules.
  • #1
97
0
"When a substance absorbs or releases heat, one of two things can happen: either its temperature changes or it will undergo a phase change but not both at the same time"

Can someone clarify this statement? During a phase change, isn't what's going on really just increasing the kinetic energy of the molecules so intermolecular forces break and thus increasing the temperature of the matter?

Thanks.
 
Physics news on Phys.org
  • #2
No. Phase change occurs in one temperature - like ice melting. As long as there is a mixture of ice and water adding heat will melt the ice, but temperature of the mixture remains constant. It is breaking of the forces that kept molecules in solid (liquid) together that consumes the heat.
 
  • #3


I can clarify this statement for you. When a substance absorbs or releases heat, it can either cause a change in its temperature or a change in its phase, but not both at the same time. This means that when a substance undergoes a phase change, such as melting or boiling, its temperature will remain constant until the phase change is complete. This is because during a phase change, the energy being absorbed or released is being used to break or form intermolecular bonds, rather than increasing the kinetic energy of the molecules. Once the phase change is complete, the temperature will then begin to change again. So, while increasing the kinetic energy of molecules can lead to a change in temperature, it is not the only factor at play during a phase change.
 

What is a phase change?

A phase change is a physical change that occurs when matter goes from one state to another, such as from a solid to a liquid or from a liquid to a gas.

What causes a phase change to occur?

A phase change is caused by a change in temperature or pressure. When these factors reach a certain point, the molecules in a substance will rearrange themselves into a different state.

How is temperature related to phase change?

Temperature is directly related to phase change. As temperature increases, the molecules in a substance will gain energy and become more active. This can cause them to break free from their bonds and change from one state to another.

What is the difference between temperature and heat?

Temperature is a measure of the average kinetic energy of the molecules in a substance, while heat is the transfer of energy from one substance to another due to a temperature difference. In other words, temperature is a measurement, while heat is a form of energy.

Can a substance have a different phase change temperature?

Yes, the phase change temperature of a substance can vary depending on factors such as pressure and the presence of other substances. This is why different substances have different melting and boiling points.

Suggested for: Phase Change & Temperature: What's the Difference?

Replies
2
Views
1K
Replies
3
Views
1K
Replies
5
Views
1K
Replies
3
Views
970
Replies
2
Views
1K
Replies
4
Views
1K
Replies
10
Views
2K
Replies
4
Views
1K
Back
Top