Class 7 Exam > Class 7 Notes > Science Olympiad Class 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 Infographics: Heat - Science Olympiad Class 7
| 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 (i.e., from a hotter object to a cooler one). Temperature, on the other hand, is a measure of the average kinetic energy of the particles in a substance. While heat refers to energy in transit, temperature indicates how hot or cold a substance is.
| 2. What are the three methods of heat transfer? | |
Ans. The three methods of heat transfer are conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between materials. Convection is the movement of heat through fluids (liquids and gases) caused by the motion of the fluid itself. Radiation is the transfer of heat in the form of electromagnetic waves, such as sunlight warming the Earth.
| 3. How does heat affect the state of matter? | |
Ans. Heat can change the state of matter by providing energy to the particles within a substance. For example, when heat is added to ice (solid), it melts into water (liquid). Conversely, when heat is removed from water, it can freeze into ice. This process is known as a phase change, and it occurs at specific temperatures for different substances.
| 4. What is the significance of specific heat capacity? | |
Ans. Specific heat capacity is the amount of heat energy required to raise the temperature of one kilogram of a substance by one degree Celsius. It is important because it determines how a substance responds to heat. Substances with high specific heat capacities can absorb and retain heat without experiencing significant temperature changes, which is crucial in many natural processes and applications, such as climate regulation.
| 5. Can heat energy be converted into other forms of energy? | |
Ans. Yes, heat energy can be converted into other forms of energy. For example, in thermal power plants, heat energy from burning fuels is converted into mechanical energy to drive turbines, which then generate electricity. Similarly, heat energy can be transformed into kinetic energy in engines or used in heat pumps for heating and cooling systems.
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