Chapter-Chapter 7. Heat Transfer in Nature Science Curiosity class 7 in english Medium CBSE Notes

Chapter 7: Heat Transfer in Nature

Definitions:

Heat: Heat is a form of energy that flows from a hotter object to a colder object.

Temperature: Temperature is the measure of how hot or cold an object is.

Conduction: Conduction is the transfer of heat through solids without movement of particles.

Convection: Convection is the transfer of heat in liquids and gases by movement of particles.

Radiation: Radiation is the transfer of heat without any medium.

Conductor of Heat: A material that allows heat to pass through it easily is called a conductor of heat.

Insulator of Heat: A material that does not allow heat to pass through it easily is called an insulator of heat.

Convection Current: The circular movement of particles in a fluid during convection is called convection current.

Thermal Equilibrium: Thermal equilibrium is the state when two objects reach the same temperature and heat flow stops.

Quick Revision Points:

• Heat always flows from hotter to colder object.
• Temperature measures the degree of hotness or coldness.
• Conduction occurs mainly in solids.
• Convection occurs in liquids and gases.
• Radiation does not require any medium.
• Metals are good conductors of heat.
• Wood and plastic are insulators.
• Convection currents cause sea breeze and land breeze.
• Dark colours absorb more heat.
• Light colours reflect heat.
• Heat transfer is useful in daily life.

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