NCERT Solutions for Class 5 EVS Chapter 15 - Blow Hot, Blow Cold

The free downloadable Solutions for Class 5th EVS Chapter 15 provides a detailed explanation of the topic Class 5 EVS Chapter 15 Blow Hot, Blow Cold.

EVS Class 5 Chapter 15 explains the difference between warmth and cold with different simple day-to-day experiments. The chapter starts with the story of a woodcutter and Mian Balishtiye, where Mian Balishtiye is observing the woodcutter and his activity of blowing air from far away. The woodcutter blows air in three different scenarios during the whole episode, which surprises Mian Balishtiye tremendously. 

• The woodcutter, while cutting the wood in the chilling atmosphere, would keep down his axe and blow air on his hands to make them warm.

• The woodcutter in the second instance kept a handi filled with potatoes on damp wood and blew air on the fire to help it burn properly. 

• The woodcutter in the third instance picked out the hot potatoes and blew air from his mouth to make it cool.  

Mian Balistiye asked the woodcutter every time he saw him (woodcutter) doing the same for a different reason. He considered this to be a weird behaviour and thought him to be a ghost or djinn. He was unaware that the air coming out of the mouth makes it hot or cold according to the temperature and distance.

Class 5 EVS Blow Hot, Blow Cold revolves around the concept of air. It covers important topics explained in brief below:

• Warm and cold air is blown out of the mouth. 

• Air is blown in different ways. For example, when whistles are made from the wrapper of toffee, a leaf, a balloon, the cap of a pen, etc. The order from loudest to softest whistles goes as- the cap of a pen, any other thing such as whistling through the mouth, by the wrapper of toffee,  a balloon and a leaf.

• Different musical instruments can be recognized, easily just by hearing their sounds. This is because the sound is affected by the vibrations the instrument produces. Some instruments are used by blowing air into it such as the flute, the mouth organ, etc.

• The air blown out of the mouth makes the mirror or glass look hazy. The reason being the warm air coming out of the mouth and the cold mirror converts the water vapour from the mouth into little drops of water on the mirror or glass. These make the glass or mirror look hazy. The same logic is applied in cleaning spectacles.

• Class 5 EVS Chapter 15 NCERT Solutions explain the effect of breathing in and out. The measurement of the chest is more when breathed in while it decreases when breathed out. 

The Difference in the rate of Breathing before and after Jumping

The rate of breathing per minute increases after jumping because our body needs more air. At the same time, the rate of breathing per minute is less before jumping because our body is resting.  This is very well explained in Class 5 EVS Chapter 15 NCERT Solutions.

The Clock inside you

Doctors use a stethoscope to check the chest by placing it on the chest. What do they do? They listen to the heartbeat, which sounds similar to a clock ticking. The heart functions to pump blood to different parts of the body. Class 5th EVS Chapter 15 has mentioned an experiment with a funnel with the help of which students can try to listen to the heartbeats. The PDF has almost 18 questions from the textbook that are solved with accuracy. 

Class 5 EVS Chapter 15 NCERT Solutions - Key Features

CBSE Class 5 EVS Chapter 15 Solutions has everything mentioned in it and has solved more than 22 questions given at the end of each topic which serves as self-explanation for students. Class 5 Chapter 15 Solutions are well-written and accurate and hence make the reader confident and independent in his studies without having to depend on additional tutors to cover up the gaps in the understanding. The freely downloadable material is accessed from anywhere, anytime.

Conclusion 

In Class 5 EVS Chapter 15 - 'Blow Hot, Blow Cold,' students will find comprehensive assistance through user-friendly explanations and examples, facilitating a thorough grasp of the content. This preparation not only enhances understanding but also boosts performance in EVS exams. The pivotal focus lies on the fundamental topic of comprehending temperature and weather concepts. Through exploration of hot and cold climates, students gain insights into the factors influencing weather conditions. The chapter imparts crucial knowledge on temperature variations, fostering comprehension of climate dynamics and its environmental impact. This foundational understanding contributes to heightened awareness of meteorological concepts, enriching students' perception of the world around them.