Class 9 Exam  >  Class 9 Videos  >  Class-9 Chapter-1 Matter in Our Surrounding Part-3 Evaporation

Class-9 Chapter-1 Matter in Our Surrounding Part-3 Evaporation Video Lecture - Class 9

FAQs on Class-9 Chapter-1 Matter in Our Surrounding Part-3 Evaporation Video Lecture - Class 9

1. What is evaporation?
Ans. Evaporation is the process in which a substance changes from its liquid state to its gaseous state at a temperature below its boiling point. It occurs when the molecules of a liquid gain enough energy to overcome the forces of attraction between them and escape into the surrounding air.
2. How does evaporation occur?
Ans. Evaporation occurs due to the random movement of molecules in a liquid. The molecules near the surface of the liquid have higher kinetic energy and can escape into the air. As these molecules escape, they take away heat energy from the remaining liquid, causing it to cool down. This continuous process leads to the conversion of liquid into vapor.
3. What factors affect the rate of evaporation?
Ans. Several factors influence the rate of evaporation. They include temperature, surface area, humidity, and air movement. Higher temperatures increase the kinetic energy of the molecules, facilitating faster evaporation. A larger surface area allows more molecules to escape, thus increasing the rate. Lower humidity creates a drier environment, promoting faster evaporation. Lastly, air movement helps in removing the water vapor from the vicinity, enhancing the evaporation rate.
4. Is evaporation a cooling process?
Ans. Yes, evaporation is a cooling process. When a liquid evaporates, the higher kinetic energy molecules escape, leaving behind the lower kinetic energy molecules. As a result, the average kinetic energy, and hence the temperature, of the remaining liquid decreases. This leads to a cooling effect. This is why we feel cool when a wet cloth or our sweat evaporates from our skin.
5. How is evaporation useful in everyday life?
Ans. Evaporation is essential in many aspects of our daily lives. It helps in cooling down our bodies through sweat evaporation. It plays a crucial role in the water cycle, where water from oceans, lakes, and rivers evaporates to form clouds and eventually precipitates as rain. Evaporation is also utilized in various industries for processes like drying, concentration of liquids, and separation of substances. Moreover, it aids in the preservation of food and other perishable items.
Related Searches

Class-9 Chapter-1 Matter in Our Surrounding Part-3 Evaporation Video Lecture - Class 9

,

Sample Paper

,

mock tests for examination

,

Class-9 Chapter-1 Matter in Our Surrounding Part-3 Evaporation Video Lecture - Class 9

,

Summary

,

Class-9 Chapter-1 Matter in Our Surrounding Part-3 Evaporation Video Lecture - Class 9

,

past year papers

,

Exam

,

study material

,

Objective type Questions

,

shortcuts and tricks

,

pdf

,

Extra Questions

,

video lectures

,

Important questions

,

Previous Year Questions with Solutions

,

ppt

,

practice quizzes

,

Free

,

MCQs

,

Viva Questions

,

Semester Notes

;