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Class 7 Science Chapter 7 Infographics - Heat
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Page 1 d e f i n i t i o n s H E A T h e a t Heat is the transfer of energy between two substances with different temperatures. Radiation is the transfer of heat through waves or fast-moving particles. Conduction is the spread of heat through different materials when there is a change in temperature. Convection is the transfer of heat cause by movement within fluid due to a change in temperature. r a d i a t i o n c o n d u c t i o n c o n v e c t i o n i n s u l a t i o n m e a s u r e To measure how warm or cool something is, a thermometer is used. Insulation is the prevention of heat from one area to another.Read More
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FAQs on Class 7 Science Chapter 7 Infographics - Heat
| 1. What is heat and how is it different from temperature? |  |
Ans. Heat is a form of energy that is transferred between systems or objects with different temperatures (thermal energy transfer), while temperature is a measure of the average kinetic energy of the particles in a substance. In simpler terms, heat refers to energy in transit, whereas temperature is a measure of how hot or cold something is.
| 2. What are the different methods of heat transfer? | |
Ans. There are three primary methods of heat transfer: conduction, convection, and radiation. Conduction involves the transfer of heat through direct contact between materials. Convection is the transfer of heat through the movement of fluids (liquids and gases), where warmer, less dense areas rise and cooler, denser areas sink. Radiation is the transfer of heat through electromagnetic waves, such as the heat from the sun reaching the Earth.
| 3. How does heat affect the states of matter? | |
Ans. Heat plays a crucial role in changing the states of matter. When heat is added to a solid, it can melt into a liquid (melting). If heat is further added, the liquid can evaporate into a gas (vaporization). Conversely, when heat is removed from a gas, it can condense into a liquid (condensation), and if heat is further removed, the liquid can freeze into a solid (freezing). These changes illustrate how heat influences the physical state of substances.
| 4. What are some real-life applications of heat transfer? | |
Ans. Heat transfer has numerous real-life applications, including cooking (where conduction and convection are used), heating and cooling systems in buildings (using convection), and thermal insulation materials that minimize heat loss. Additionally, heat transfer principles are essential in various engineering fields, such as designing engines, refrigerators, and heat exchangers.
| 5. Why is understanding heat important in our daily lives? | |
Ans. Understanding heat is important in our daily lives because it helps us make informed decisions about energy use, cooking, and comfort in our living environments. Knowledge of heat transfer can lead to more efficient heating and cooling systems, better insulation, and energy conservation practices, ultimately saving money and reducing environmental impact.
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Document Description: Infographics: Heat for Class 7 2025 is part of Science Class 7 (Old NCERT) preparation.
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