Chapter 4: CBSE Class 7 Science NCERT Book (PDF)

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Chapter 4 (Heat) of the Class 7 Science NCERT Book (PDF) is available here for download in PDF format. Download and prepare for the CBSE Class 7 Science exam. This is one of the most important chapters of the CBSE Class 7 Science NCERT manual and many important questions are formulated from this chapter.
Heat – Chapter 4: Class 7 Science NCERT Book (PDF): Download Now
A Snapshot of the Class 7 NCERT Science Book (PDF) Chapter 4:

Important topics in this chapter:
Hot and cold objects
Warm cold
Temperature
Thermometer
Measuring temperature
⇒ Clinical thermometer
Reading a thermometer
Normal human body temperature is 37 ° C
Laboratory thermometer
Conduct
Materials that allow heat to pass through them easily are heat conductors.
Bad conductors are called insulators
⇒ This mode of heat transfer is known as convection
The sea air is called the sea breeze
This is called the land breeze
The sun’s heat comes to us through another process known as radiation
Woolen clothes keep us warm in winter
⇒ Our sense of touch is not always a reliable indicator of how warm an object is.
Temperature is a measure of how warm an object is.
The thermometer is a device used to measure temperature.
The clinical thermometer is used to measure our body temperature. The range of this thermometer is 35 ° C to 42 ° C. For other purposes, we use laboratory thermometers. The range for these thermometers is typically –10 ° C to 110 ° C.
⇒ Normal human body temperature is 37 ° C.
Heat flows from a body at a higher temperature to a body at a lower temperature. Heat can flow from one object to another in three ways. These are conduction, convection and radiation.
⇒ In solids, heat is generally transferred by conduction. In liquids and gases, heat is transferred by convection. No medium is required for radiant heat transfer.
Materials that allow heat to pass through them easily are heat conductors.
Materials that do not pass heat easily are called insulators.
Dark colored objects absorb more heat than light colored objects.
⇒ This is the reason why we feel more comfortable in light colored clothes in summer.
⇒ Woolen clothes keep us warm during the winter. This is because wool is a poor conductor of heat and there is air trapped between the fibers.


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