Evaporation
Chapter Name : Matter In Our Surroundings |
Sub Topic Code : 102_09_01_05_01 |
Topic Name : Evaporation |
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Sub Topic Name : Factors Affecting Evaporation |
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Introduction
Discuss “What happens when we keep water in a beaker and observe it for a long time”
Pre-Requisites:
Matter is made of particles, change of states of matter
Activity:
When there is high speed wind, clothes dry fast , Hang some wet clothes inside a room without fan and some in another room with fan. Now note the time in which they dry
Real Life Question:
“Do we always need to heat or change pressure for changing the state of matter?”
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| rate of evaporation increases with–, Increase of surface area, Increase of temperature, Decrease in humidity, Increase in wind speed | These are factors affecting evaporation |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Keep a beaker filled with water and change all the four factors one by one | Study the effect of the four factors which change reate of evaporation |
Real life uses :
We use this when we dry our utensils, clothes etc.
Practical examples around us
| Examples | Explainations |
|---|---|
| while putting clothes for drying up we spread them out. | Increase in surface area |
| It is a common observation that clothes dry faster on a windy day. | Increase in wind speed |
What you learn in Theory:
Evaporation, factors affecting evaporation
What you learn in Practice:
Knowledge of these factors will help us in controlling rate of evaporation for practical purposes