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Introduction: What is Vapour Pressure?
Vapour pressure is one of the most important concepts in chemistry, especially when studying liquids and gases. Understanding vapour pressure helps students learn how liquids change into gases and how temperature affects evaporation. In this video, we explain what vapour pressure is, its definition, factors affecting vapour pressure, and real-life examples. This lesson is perfect for students of class 9, 10, 11, and 12 chemistry and anyone preparing for exams.

Definition of Vapour Pressure in Chemistry
Vapour pressure is defined as the pressure exerted by the vapour of a liquid when it is in equilibrium with its liquid phase at a given temperature. In simple words, vapour pressure measures how easily a liquid evaporates into the air. Liquids with high vapour pressure evaporate quickly, while liquids with low vapour pressure evaporate slowly. This concept is essential in understanding evaporation, boiling, and intermolecular forces in chemistry.

Factors Affecting Vapour Pressure
There are several factors that influence vapour pressure. The most important factor is temperature. As temperature increases, vapour pressure also increases because more molecules gain energy to escape into the vapour phase. Another factor is the nature of the liquid. Liquids with weak intermolecular forces have higher vapour pressure, while liquids with strong intermolecular forces have lower vapour pressure. Understanding these factors helps students solve numerical problems and conceptual questions in exams.

Examples of Vapour Pressure in Daily Life
Vapour pressure can be observed in daily life. For example, petrol evaporates faster than water because it has higher vapour pressure. Similarly, perfumes spread quickly in the air due to their high vapour pressure. On the other hand, substances like oil evaporate slowly because they have low vapour pressure. These real-life examples make it easier for students to understand the concept clearly and relate chemistry to everyday experiences.

Importance of Vapour Pressure in Chemistry
Vapour pressure plays a crucial role in many chemistry topics, including boiling point, evaporation, condensation, and phase equilibrium. It is also important in industries such as pharmaceuticals, environmental science, and chemical engineering. Understanding vapour pressure helps students build a strong foundation for advanced chemistry concepts.

Conclusion and Exam Tips
By the end of this video, you will have a clear understanding of vapour pressure, its definition, factors affecting vapour pressure, and real-life applications. Remember key terms like evaporation, intermolecular forces, boiling point, equilibrium, and temperature effect to perform better in exams. Don’t forget to like, share, and subscribe to Cogitaverse for more chemistry lessons explained in an easy way.

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