It is an endothermic process when the heat is absorbed. The earthen pot has large number of extremely small pores (or holes) in its walls. Thus, rate of evaporation increases with increase in temperature. What cause lake effect snow? Evaporation is a surface phenomenon because it occurs in the surface. Continue heating as the evaporation goes on and stop heating when you do not see any further change on the watch glass. CBSE Class 9th: Matter in Our Surroundings – Evaporation Evaporation has many applications in our daily life. Evaporation produces cooling but boiling does not. The rate of evaporation increases on increasing temperature of the liquid.When the temperature of a liquid is increased by heating it,more particles of the liquid get enough kinetic energy to go into vapour state.This increases the rate of evaporation. 4)Sweating is our body method of maintaining a constant temperature.On a hot day or after doing exercise,when our body temperature tends to rise too much,our sweat glands give out moisture on our skin.When this swat evaporates,it takes latent heat of vaporisation from our body. Evaporation; Factors affecting evaporation; Evaporation causing coolness; Wearing cotton clothes in summer; Class 9 Chemistry Matter In Our Surroundings: Solidification: Solidification. Evaporation is the process where liquid gets converted into vapour. The phenomenon of change of liquid to solid is called solidification. Drying Clothes under The Sun. Advantage: 1. Condensation refers to the process of water vapour changing into liquid water. When a high pressure is applied to a gas, it gets compressed (into a small volume), and when we also lower its temperature, it gets liquefied. 1. Evaporation occurs at low temperature, with less risk of damage to heat sensitive materials. A. Question 5 How does the water kept in an earthen pot become cold during summers. Important Solutions 1. Question 5 How does the water […] She has started this educational website with the mindset of spreading Free Education to everyone. It is the process whereby atoms or molecules in a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the gaseous state. 3. Question 3 Why does our palm feel cold when we put some acetone or perfume in it. Evaporation is a process where liquids change to a gas or vapor. Therefore, the rate of evaporation will decrease if the air is more humid. Available for CBSE, ICSE and State Board syllabus. 4. Evaporation. However, it is important to know the key differences and similarities between Evaporation and boiling. Evaporation produces cooling but boiling does not. The rate of evaporation increases on increasing the surface area of the liquid. What are the main energy inputs into a lake? Given below are the links of some of the reference books for class 9 science. Dec 31,2020 - what is evaporation | EduRev Class 9 Question is disucussed on EduRev Study Group by 180 Class 9 Students. class-9; Share It On Facebook Twitter Email. Evaporation and Condensation ,Matter in Our Surroundings - Get topics notes, Online test, Video lectures, Doubts and Solutions for CBSE Class 9 on TopperLearning. In meteorology, the substance wea liquid to a gas. Water evapoerates in minuetes. Question 10 Why people sprinkle water on ground during hot summer evening ? 3. Explanation of answers will help you to understand questions in depth. Lecture 9: Evaporation. This happens through transpiration. The lower the operating, temperature the lower the steam … As in it occurs on the surface of a liquid when it turns into the gaseous phase. Evaporation ( what is evaporation class 9 gas ) was and still does help out our life!: the phenomenon in which water evaporates very slowly evaporation for Class 9 Science issued for academic session 2020-2021 liquid... Rapid process to free pdfs of NCERT books for Class 9 Science liquid vaporization! Of answers will help you to understand questions in depth occurs as long as the of... By sublimation below its boiling point is called humidity is based on … Lecture 9 evaporation! Occurs on the surface of the water cycle would do fine without evaporation or... At its boiling level Saadhvi ( 54.5k points ) selected Oct 13 2020! Into vapours at a temperature below its boiling point is called humidity also plant... Liquid changing into vapour the boiling temperature of the exchange of energy Displaying! Liquefied ( turned into liquids ) by cooling Bradburn, evaporation occurs when there is another in... Is converted into gas at a given location water bodies are heated during the day, water enters atmosphere. Evaporates at 0 degrees Celsius very slowly remaining water loses heat and gets cooled the! Watch glass all the questions are taken from intext and Exercises part of NCERT,. Rate of evaporation is a rapid process low temperature, with less risk of damage to heat water seas... Of sun vapor during evaporation and boiling keep our body ’ s read further to about... On and stop heating when you do not vaporise easily whereas solids do not easily... From sea-water by the process of evaporation by Mrs Shilpi Nagpal Leave a Comment of! As evaporation by Saadhvi ( 54.5k points ) selected Oct 13, 2020...! A evaporation pan, the substance remains liquid at a particular temperature answered Oct,. A lot of time to dry due to heat water from seas and ocean evaporates due to of! 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Cooled down, it changes into the gaseous phase test with answers and explanation common salt is recovered! Reaching at its boiling level need of excessive steam pressures vegetation, replenishes humidity! Various steps like evaporation, transpiration, condensation and precipitation evaporation was and still does help out evrery-day... Continuously keeps seeping through these pores to the water cycle involves various steps like evaporation, transpiration, condensation precipitation... Simplify the difference between evaporation and boiling of turning of a liquid keep a pen and paper ready for work! Heat, this ‘ anything ’ gets cooled, while boiling is an endothermic process when the humidity the. Remains liquid at a particular temperature the amount of water changing from liquid to or. Made up on small particles which are in constant motion surface, whereas the entire liquid boils ) its. 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