Is Boiling Point And Condensation Point The Same: Detailed Facts


The boiling point is a temperature at which the liquid is converted into the gaseous phase, while the condensation of gas molecules reverses this process.

The vapor evaporated loses its kinetic energy and condenses back to the liquid at the same temperature. So, is Boiling Point And Condensation Point The Same? Let us try to answer this question in this article.

When is Boiling Point and Condensation Point the Same?

The boiling point converts the liquid to a gaseous form while the condensation results in the conversion of gas into the liquid state.

The matter in its gaseous or liquid state which has no impurities mixed in it has a common boiling point and a condensation point having a particular chemical composition.

How does boiling point and condensation point same?

The condensation of vapors forms a liquid, and vapor forms upon boiling the liquid at the same point.

At a boiling point and condensation point, the phase of the liquid turns to gaseous and the gaseous state turns to liquid respectively. Both these processes occur at the same point hence the boiling point and condensation point are the same.

If you keep water boiling in a container and close it with a lid, then we can carefully see that as the temperature of the water goes to 100 degree Celsius and water starts boiling the evaporated water vapors settles on the lid of a container and then condense and form drops of water on the lid and again gets mixed into the volume of water in the container.

Condensation of vapors on lid;
Image Credit: Pixabay

The heat energy acquired by the molecules of water will be given off in the form of the kinetic energy of the vapors. Once this kinetic energy is reduced as the vapors evaporate, the temperature of the vapors comes down and gets cool, and condenses back to the liquid.

The water vapors formed will continue to evaporate and then condense and return back to the volume until the temperature of the water goes below 100 degrees. Hence, we can confirm that the boiling point of the water as well as the condensation of water vapors back into the liquid form, both happens at the same temperature.

Why are Boiling Point and Condensation Point the same in Temperature?

Condensation is a reversion of the process occurred at boiling point.

The evaporated vapors upon reaching the boiling point of a particular liquid can be condensed back to the liquid state by compressing the vapors at an equal temperature; hence the boiling point and condensation point occurs at the same temperature.

At boiling temperature, the liquid phase change into the vapor state as the amount of heat energy supplied to the liquid matter is utilized to break the bond and the potential energy of the molecules is converted into the kinetic energy, and the intermolecular spacing between the atoms increases due to which the density get reduce and the molecules rise above.

As these vapors leave the container the kinetic energy of the vapor particle is reduced on its way and the temperature also comes down, at the same time the vapor pressure is developed gradually. If these vapors are compressed at the same temperature then the vapors phase turns back into the liquid state.

We can depict this with the graph below:-

is boiling point and condensation point the same
Boiling Point and Condensation Point at Equal Temperature

The above graph is plotted to show the variation in the temperature with the rising time while boiling water. Once the water reaching at its boiling point which is 100 degrees Celsius, the water will turn into a vapor state. The same is shown in the graph in light blue colour.

At a phase change line, the water turns into vapors and these vapors can be converted back into the water again. This is achieved by condensing the vapors evaporating by accumulating them on the lid of the container. By applying the lid the pressure is created in the container that is sufficient to compress and condense the water vapors.

Hence, the condensation point where the water vapor turns back into the water state takes place at the boiling point itself. Therefore, the boiling point and condensation point are the same.

Difference Between Boiling Point and Condensation Point

The process that occurs due to boiling point is basically the reverse of the condensation process that transpires. Let us discuss some of the differences between the boiling point and condensation point here below:-

1. At a boiling point the liquid state of the matter is converted into the gaseous state while at the condensation point the vapor state is transformed back into the liquid phase.

2. The boiling point is termed for the liquid matter while the condensation is termed for the gaseous states.

3. For the temperature of the liquid to reach the boiling point, a lot of heat energy has to be acquired by the molecules of the liquid while on the other hand, for the condensation process to occur, the amount of heat has to escape from the system for molecules to condense together.

4. At the boiling point, the kinetic energy associated with the molecules is very high and the molecules after breaking intermolecular bonds move in the random motions, on contrary, at a condensation point, the kinetic energy of the molecules is converted into the potential energy, and molecules bond back together occupying the least space as it can holding each other molecules.

5. There is a reduction in the pressure at the boiling point while the pressure generated is more at the condensation point.

6. The density of the matter is reduced upon boiling while the density increases as the gas condenses into a liquid phase.

7. The boiling point decreases at higher altitudes while the condensation will be more.

8. The kinetic energy of the molecules is high at a boiling point and the kinetic energy is nil at the condensation point.

Frequently Asked Questions

What is the difference between boiling point and boiling?

The boiling is a process of supplying heat energy to the system raising its temperature above the room temperature.

The boiling point is the final temperature of the liquid up to which the liquid can acquire the heat and at this temperature, the liquid state of the matter turns into the vapor state, the temperature below this boiling point is known as boiling and no phase change occurs at this temperature.

How boiling point and condensation points are affected?

The boiling point or the condensation of the liquid and vapor respectively depends upon the external atmospheric condition in which this process takes place.

The factors affecting the boiling point and the condensations are the density of the matter, the atmospheric pressure, and temperature, and the impurities added.

Does adding impurities to the liquid affect the boiling point of a liquid?

Indeed! On adding impurities the boiling point of the liquid goes high depending upon the type of impurity added.

The heat energy supplied to the liquid will be utilized by the molecules of impurities to break the bonds and mix in the liquid, at the same time raising the boiling point of the liquid.

Does condensation is a method used for the separation of impurities in liquid?

Condensation is a method that can be used for the separation of impurities.

If the impurities are mixed in a liquid, then if the boiling point of the liquid is smaller than the impurity mixed then the vapors evaporated can be separated by the condensation method leaving behind the impurities.

Please click to read more on Boiling Point And Surface Area.

AKSHITA MAPARI

Hi, I’m Akshita Mapari. I have done M.Sc. in Physics. I have worked on projects like Numerical modeling of winds and waves during cyclone, Physics of toys and mechanized thrill machines in amusement park based on Classical Mechanics. I have pursued a course on Arduino and have accomplished some mini projects on Arduino UNO. I always like to explore new zones in the field of science. I personally believe that learning is more enthusiastic when learnt with creativity. Apart from this, I like to read, travel, strumming on guitar, identifying rocks and strata, photography and playing chess. Connect me on LinkedIn - linkedin.com/in/akshita-mapari-b38a68122

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