Blow Hot Blow Cold Class 5 Notes CBSE EVS Chapter 15 (Free PDF Download)

Summary of Class 5 EVS Blow Hot, Blow Cold

• The woodcutter used to blow on his hands to keep them warm in the winter. He blows on his hot potato to cool it.

• He also blew on the fire of the chulha to help the wood burn.

• We blow to cool warm things as well as to warm cold things.

• The hot air that we breathe out contains water vapor which turns into tiny droplets of water when it comes in contact with a colder surface like a mirror.

• An instrument that is used to hear the heartbeats is called a stethoscope.

1. Storyline of the character Mian Balishtiye:

• Mian Balishtiye was a curious little man.

• One cold day he saw a woodcutter in the woods. He noticed that the woodcutter was occasionally blowing on his hand while cutting wood.

• When he asked the woodcutter about it, he said that he was blowing on his hand to make them warm as his hands were frozen in the cold.

• After some time Mian saw the woodcutter blowing to start a fire in the chulha.

• Mian was surprised and wondered if the woodcutter could blow fire with his mouth.

• Then he saw the woodcutter blowing on hot potatoes. He was so astonished and went to ask him why he was making the hot potatoes even hotter.

• He was frightened by the woodcutter’s reply when he said he was blowing on the hot potatoes to make them cool to eat.

• Mian was scared and started to run away, thinking the woodcutter was a dangerous creature who could blow hot and cold.

2. How Many Breaths in One Minute?

• If you put your finger under your nose, you can feel the air that you breathe out through your nose.

• In one minute an adult breathes 8 to 16 times, and infants can have up to 44 breaths per minute.

• After doing something physical for a long time, like jumping or running, we feel breathless.

• When we feel breathless we tend to take more breaths in and out of our body.

3. The Clock Inside You

• Doctors use stethoscopes to hear out heartbeats.

• The sound of a heartbeat is like a ticking clock.

• We can make our own stethoscope using a tube and a funnel to listen to our own heartbeat.

Difficult Words with Their Meanings and Usage

1. Woodcutter - a person who cuts trees.

Usage - The woodcutter used to blow on his hands to keep them warm in the winter.

2. Stethoscope - an instrument used to hear the sound of heartbeat.

Usage - Doctors use stethoscopes to hear out heartbeats.

Class 5 EVS Blow Hot, Blow Cold Revision Notes: Practise Questions

A. Fill in the Blanks:

1. While he was cutting wood ___ was watching him from a corner.

Ans: Mian Balishtiye

2. Seeing this ___ person the woodcutter was amazed and amused.

Ans: tiny

3. The woodcutter picked up two stones and made a ___.

Ans: chulha

B. Choose the Correct Option:

1. Which one of the following instruments is used to listen to heartbeats?

1. Gyroscope

2. Telescope

3. Stethoscope

4. Microscope 

Ans: (c) Stethoscope

2. Infants can have up to __ breaths per minute

1. 25

2. 33

3. 38

4. 44

Ans: (d) 44

C. Solved Examples

1. Have you warmed your hands in winter by blowing on them when they are cold? How does it feel?

Ans: Yes, I have warmed my hands by blowing on them during the winter. It's very comfortable.

2. Blow hard from your mouth onto your hands. How did you find the air from your mouth as compared to the air around you? Was it hotter or cooler?

Ans: When I blow hard from my mouth onto my hands, the air from my mouth feels hotter than the surrounding air.

3. Now put your hands at some distance from your mouth and blow again. Does the air from your mouth feel warm? Why?

Ans: When the hands are placed some distance away from the mouth, the air blown from the mouth does not feel particularly warm. This occurs because the air travels a distance and becomes mixed with the surrounding air.

4. Can you think of any other way in which you use the warmth from your breath?

Ans: Yes, I can think of another way to use the warmth from my breath. When someone's eyes become red or they sustain a minor injury, a portion of a handkerchief is warmed by blowing air over it. The warm handkerchief is used to keep the eyes or injured part warm. This provides some solace.

Short Question and Answer of Class 5 EVS Blow Hot, Blow Cold

1. Balishtiye saw that the woodcutter was trying to cool the hot potatoes by blowing on them. What would have happened if he had eaten the potatoes without cooling them?

Ans: Eating the potatoes without first allowing them to cool may result in mouth burns.

2. Have you ever burnt your tongue when you ate or drank something that was too hot? How do you cool some food when it is too hot?

Ans: Yes, I have occasionally burned my tongue while eating hot pakodas or drinking hot tea. I usually blow cold air over hot food to cool it down. We occasionally use a fan to keep the food cool.

Important Points to Remember

• We should know how our breath works.

• We can warm our hands by blowing on them in cold seasons.

• We also blow on hot things to make them colder.

Importance of CBSE Class 5 EVS Chapter 15 Blow Hot Blow Cold

1. How changes in our breaths can produce different results: As the name of this chapter suggests, blowing off something hot or cold will deliver different results. A man watched a woodcutter in this story blow on his hands before cutting wood. When he asked the woodcutter the reason, he said that his hands were frozen cold. His breath’s warmth helped him to warm his hands and prepare for cutting wood.

2. How can we use breath for lighting fire: In the next incident of Blow Hot Blow Cold, the man observed that the woodcutter blew fire in the chulha he made with stones. To his surprise, the woodcutter explains how the air in his breath helped the fuel to catch fire faster.

3. Scientific reasons behind the use of breaths:He also used his breath to cool down the hot potatoes he cooked. The man was amazed to find the reasons. He could not figure out the scientific reason behind the outcomes. This is what states the importance of this chapter. The same breath can be used to cool down hotter objects and warm colder objects. Understand the fundamental concepts of this chapter to answer Class 5 EVS Chapter 15 MCQ correctly.

Benefits of Vedantu’s Blow Hot Blow Cold Worksheets and Revision Notes

• The revision notes will help accomplish preparing this chapter faster due to the easier explanation of all the sections. Learn how the experts have explained the concepts of cooling and warming of things using breath.

• Once done preparing the chapter, you can proceed to solve the Class 5 EVS Chapter 15 worksheet provided with the revision notes. It will help you evaluate your preparation level. You will also be able to locate where you need to work harder and make your preparation much better.

• Score more in the exams by checking the Class 5 EVS Chapter 15 worksheet with answers. Find out how the subject experts have compiled answers to all the questions and sharpen your answering skills.

Download Class 5 EVS Chapter 15 Worksheet and Revision Notes PDF

Get the free PDF version of these files and complete studying this chapter efficiently. Recall what you have studied before an exam using these notes. Resolve doubts on your own and prepare a strong foundation to answer any fundamental question of this chapter accurately.

Preparation Tips for Class 5 EVS Blow Hot, Blow Cold

Follow the suggested tips listed below for fully preparing the chapter Blow Hot, Blow Cold:

• Read the complete chapter, try understanding the storyline and characters while reading. Mark all the difficult words within the chapter.

• Once you have read the whole chapter, search for the meanings of the difficult words and memorise them.

• Attempt the questions that are written in the book you are using and then move on to revision notes.

• With the help  of revision notes, you will be able to summarise the story, understand the significant elements of the chapter and practise the important questions.

• Students are advised to take help of Class 5 EVS Blow Hot, Blow Cold revision notes for understanding the important aspects of this chapter such as scientific uses of breaths, etc.

Conclusion

In Class 5 EVS Chapter 15 - 'Blow Hot, Blow Cold,' the focus is on understanding temperature and weather concepts. Students explore distinctions between hot and cold climates, delving into factors influencing weather conditions. This chapter offers essential insights into temperature variations, helping students comprehend climate dynamics and its impact on the environment. By grasping fundamental meteorological concepts, students enhance their knowledge and develop a foundational understanding of climate, fostering increased environmental awareness. Free downloadable revision notes and worksheets for Blow Hot, Blow Cold are available, encouraging thorough reading and practice. Students are advised to utilize CBSE Class 5 study materials for comprehensive learning.