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Vaporization and Evaporation seem to have similar meanings, they are very different terms. Both of them are basically phase transitions, but the only major point of difference between the transitions is about the temperature at which the phase supposedly occurs. Usually on a molecular level, Vaporization and Evaporation are two processes that vary from each other on levels of how or what their temperature is; and the point in time where the transition takes place.
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Key Takeaways: Vaporization, Evaporation, Boiling, Difference between vaporization and evaporation, Water Cycle, Sublimation Process, Phase Transition
What is Vaporization?
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The transitional phase of an element where the solid phase of a compound transforms into the liquid phase, and consecutively to vapour (which is a gaseous state) is referred to as the process of Vaporization. The phenomenon can be usually seen during boiling, or simply by the sublimation process.
The conversion can be seen by the application of heat that is responsible to cause a liquid substance to dissipate. The transition state we normally see in the process of Vaporization is when solid transforms to liquid, and then to a gaseous form. The transition is not direct and follows procedure from one state to another. Vaporization can occur in twofold scenarios; usually boiling or sublimation.
Boiling is the process where the transition occurs from the liquid phase to the gaseous phase due to the application of heat. The sublimation process, however, usually takes place when a solid is directly transformed into a gaseous phase, without passing via the liquid phase.
Read More: Critical Temperature
What is Evaporation?
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Evaporation is generally a part of vaporization, as much as boiling. Evaporation usually involves direct transformation to a gaseous state, from the liquid state of matter. The process of evaporation is considered extremely significant in the water cycle.
Evaporation, in the water cycle, is commonly possible to attain due to solar energy. In a nutshell, solar energy helps cause evaporation of water from numerous sources, such as oceans, ponds, rivers, besides other water bodies.
Read More: Melting and Boiling Point
What is the Process Involved in Vaporization and Evaporation?
Vaporization can be classified into two sections: Evaporation and Boiling. It can be described as an element’s transitional phase starting from the solid phase to the liquid phase and subsequently reaching the gaseous phase. In simple words, the succession involves: solid to liquid to gas. We normally apply heat for the process to take place consecutively.
On the flipside, the process of evaporation normally involves the transition from the liquid phase to the gaseous phase, without including the solid phase. The transition occurs below the boiling temperature.
This shows that evaporation is a widely discussed segment of the vaporization process, including the transformation of liquid to gas. Evaporation is one of the major ingredients where water moves in the water cycle from the liquid state in the form of atmospheric water vapour.
Read More: Boiling Point Elevation
Difference Between Vaporization and Evaporation
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One of the most significant points of differences between vaporization and evaporation is their phase of transitions, and where they are likely to appear. Here are some major points that could help dissect each term:
| Vaporization | Evaporation |
| Vaporization is the transitional phase of a compound that usually appears during the boiling or sublimation process. | Evaporation can be defined as a part of vaporization that appears at temperatures below the boiling point. |
| Vaporization involves changing the state of matter from solid, to liquid and ultimately to gas. | However, evaporation involves the change of the state of matter directly from liquid to gas. |
| Heat is commonly not required to steer the process of vaporization. | Heat may or may not be useful depending completely on the process of evaporation. |
| Vaporization commonly occurs at a speedy pace, alongside consuming minimal energy. | Evaporation, however, appears at a slower pace, consuming relatively more energy. |
| Vaporization can transform all of the given water into gas. | Evaporation, however, is capable of transforming water that belongs at the top level into gas. |
| The movement of the molecules, in the process of vaporization, appears from below the liquid surface. | The movement of molecules, in the process of evaporation, helps vaporize from the surface of the liquid. |
These are some major points of differences between the terms, even though they depict similar properties.
Points to Remember
Following are some important points:
- The process of vaporization is a transitional phase that usually appears either by boiling or sublimation.
- Evaporation is a part of Vaporization that occurs at a temperature which is below the boiling point.
- Based on a molecular level, Vaporization and Evaporation are processes that vary from one another on levels of how or what their temperature is; and the point in time where the transition takes place.
- Vaporization includes the changing of the state of matter from solid, to liquid and ultimately to gas.
- Evaporation usually skips the solid phase, and directly converts the state of matter from liquid to gas.
- Vaporization is a fast process, while evaporation is generally very slow.
Sample Questions
Ques: Write a brief note on Vaporization. (2 Marks)
Ans: Vaporization is widely known as a phase transition of a compound from the liquid state of matter to vapour. The transition of the element usually appears at the boiling temperature, and due to the movement of the molecules that appear from below the liquid surface. Vaporization takes place as a result of increased temperature that leads to the kinetic energy of the molecules to increase side by side as well.
Ques: What is meant by Evaporation? (2 Marks)
Ans: Evaporation can largely be described as a segment of vaporization that takes place at temperatures below the boiling point. In brief, evaporation is responsible for the change of the state of matter directly from liquid to gas. Normally, the particles tend to accumulate energy in the form of heat from any source that gives it out, mostly like solar energy or furnaces, and then transforms it from liquid to a gaseous state.
Ques: Elaborate the process involved in vaporization. (3 Marks)
Ans: The form of transition we normally see in the process of Vaporization is the conversion of solid to liquid, and then to a gaseous form. Simply, Vaporization can be dissected into two sections: Evaporation and Boiling. The movement of the molecules that takes place in the vaporization process usually appears from below the liquid surface. In simple words, the succession involves: solid to liquid to gas. We normally apply heat for the process to take place consecutively.
Ques: What is the process of Evaporation? (3 Marks)
Ans: The change of the state of matter from liquid into the gaseous form at a temperature which is below the boiling point is known as evaporation. Evaporation generally is capable of converting water that belongs at the top level into gas. Since it occurs below the boiling point, it is possible that the process may or may not include the source of heat. It depends entirely on the type or process of evaporation. One major instance of evaporation is when water transitions into steam.
Ques: List at least 3 major points of differences between Evaporation and Vaporization. (3 Marks)
Ans: Here are some differences:
| Vaporization | Evaporation |
| Vaporization is the transitional phase of an element that usually appears during the boiling or sublimation process. | Evaporation can be defined as a part of vaporization that appears at temperatures below the boiling point. |
| Vaporization occurs at a speedy pace, consuming minimal energy. | Evaporation, in contrast, appears at a slower pace, consuming relatively more energy |
| Heat is commonly not required to steer the process of vaporization. | Heat may or may not be useful depending completely on the process of evaporation. |
Ques: Elaborate upon what happens to the particles prior, during, and following the process of Vaporization. (2 Marks)
Ans: The loosely packed, energetic liquid particles at the surface tend to escape in the form of vapour (steam) as the temperature hikes. Subsequently, the liquid then evaporates with a faster pace, as the heat increases, and the particles tend to break away with enough accumulated energy. The particle breaks away due to the heat that loosened its intermolecular attraction. The movement of the molecules, in the process of vaporization, appears from below the liquid surface.
Ques: “Water is usually in the form of liquid if placed at room temperature.” State why. (3 Marks)
Ans: Water is usually in the form of liquid when kept at room temperature due to the hydrogen bonds. These bonds are responsible for clasping the molecules closely together for fractions of seconds. Naturally, water is capable of forming intermolecular H-bonding due to the existence of hydrogen atoms, besides an electronegative atom, which is, Oxygen. Now, since water has a fixed mass with a fixed volume, it flows and takes the shape of the container it has been placed in. Mainly because of that, the motion tends to slow down, holding the particles closer to each other. This is the primary reason why water is found in the form of liquid at room temperature.
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