In this post, you will find NCERT Science Class 9 Chapter 1 Activity solutions. In Class 9 science chapter 1 matter in our surroundings consists of NCERT Activity 1.14 Class 9 Science Explanation with a conclusion.
NCERT Activity 1.14 Class 9 Science Explanation with a conclusion
You are suggested to study NCERT activity 1.14 class 9 science
explanation with a conclusion so that you can attempt questions based on the
activity 1.14 class 9 science.
Activity 1.14 Class 9 Science
·
Take 5 ml of water in a test tube
and keep it near a window or under a fan.
·
Take 5ml of water in an open china dish and keep it near a window or
under a fan.
·
Take 5 ml of water in an open china dish and keep it inside a cupboard
or on a shelf in your class.
·
Record the room temperature.
·
Record the time or days taken for the evaporation process in the above
cases.
·
Repeat the above three steps of activity on a rainy day and record your
observation.
·
What do you infer about the effect of temperature? Surface area and wind
velocity on evaporation?
 |
| Evaporation |
Observation Activity 1.14 Class 9 Science
i.
The surface area of the test tube is less so less water
will evaporate from the test tube. So, it will take a long time for
evaporation.
ii.
The surface area of two china dishes is the same in which
5 ml water has been taken, but one china dish is kept near a window or under a fan
while another is kept inside the cupboard. So, the evaporation will be faster from
the china dish which is kept in the window or under the fan, and on the other side
evaporation for the china dish which is kept inside the cupboard will be slow.
iii. On rainy days, there is more humidity in the
atmosphere than on other days. Evaporation takes a longer time on rainy days.
Conclusion Activity 1.14 Class 9 Science
The rate of evaporation
depends on the following factors
i.
The rate of evaporation increases
with the increasing speed of air.
ii.
The rate of evaporation increases by increasing the surface area.
iii.
The rate of evaporation decreases
with an increase in the presence of humidity in the air.
Queries based on Activity 1.14 Class 9 Science
1. Define evaporation.
Ans. – The phenomenon of change of a liquid into vapours at any temperature below its boiling point is called evaporation.
2. How do surface area is related to evaporation?
Ans.- The rate of evaporation is directly proportional to the surface area. so when surface area increases, the rate of evaporation also increases.
3. How does temperature affect evaporation?
Ans.- The rate of evaporation increases when the temperature of the surroundings increases.
4. How the speed of wind is related to evaporation?
Ans. – The rate of evaporation is directly proportional to the speed of the wind.
5. Name the factors which affect the rate of evaporation.
Ans. i). Temperature ii). Surface area iii). Speed of wind iv). Nature of liquid
Related Topics
1. First Activity- Activity 1.1 Class 9 Science
2. Previous Activity - Activity 1.13 Class 9 Science
