Class 7 Exam > Class 7 Videos > Science Class 7 > Introduction to Conduction and Convection
Introduction to Conduction and Convection Video Lecture | Science Class 7
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FAQs on Introduction to Conduction and Convection Video Lecture - Science Class 7
| 1. What is conduction and convection? |  |
Ans. Conduction is the process of heat transfer through direct contact between particles or objects. In conduction, heat energy is transferred from the hotter object to the colder object through molecular vibrations. On the other hand, convection is the process of heat transfer through the movement of fluids, such as liquids or gases. It occurs when the hotter fluid rises and the cooler fluid sinks, creating a continuous circulation of heat energy.
| 2. How does conduction occur? | |
Ans. Conduction occurs when there is a difference in temperature between two objects in direct contact. The particles in the hotter object have more energy and vibrate at a higher frequency. These particles collide with the particles in the colder object, transferring energy and increasing their temperature. This transfer of heat continues until both objects reach thermal equilibrium, where their temperatures become equal.
| 3. What are some examples of conduction? | |
Ans. Some examples of conduction include:
1. Touching a hot stove and feeling the heat transfer to your hand.
2. Placing a metal spoon in a hot cup of tea and feeling the handle become warm.
3. Walking barefoot on hot sand and feeling the heat transfer from the sand to your feet.
4. Heating a metal rod at one end and observing how the other end also becomes hot through conduction.
| 4. How does convection work? | |
Ans. Convection works by the movement of fluids due to the difference in density caused by temperature variations. When a fluid is heated, it becomes less dense and rises, creating a convection current. As the fluid rises, it transfers heat energy to the surrounding cooler fluid. The cooler fluid then becomes denser and sinks, completing the cycle. This continuous movement of fluids allows for the transfer of heat energy from one location to another.
| 5. What are some examples of convection? | |
Ans. Some examples of convection include:
1. Boiling water in a pot - the heat from the stove causes the water at the bottom of the pot to become hot and rise to the top, while the cooler water sinks.
2. Heating a room with a radiator - the hot air rises from the radiator, creating a convection current that circulates heat throughout the room.
3. Cooking food in an oven - the hot air inside the oven rises and circulates, cooking the food evenly.
4. Wind currents - the uneven heating of the Earth's surface causes air to rise and sink, creating wind currents that transfer heat around the globe.
Text Transcript from Video
conduction is a transfer of heat between
substances that are in direct contact
with each other and it mainly happens in
solids the heat is conducted from atom
to atom using a kinetic energy of the
particles in other words by vibrating
the best set conductor the more rapidly
heat will transfer have you ever noticed
that metal benches tend to feel colder
than wooden ones believe it or not the
nut colder they only feel colder because
they conduct heat away from your bottom
better than wood and he perceived that
heat leaving your bomb as cold metals
are particularly good at conducting heat
because of their free electrons that
move about the structure colliding with
the positive ions and transferring the
kinetic energy to them convection
happens in gases and liquids as a gas or
a liquid is heated it warms expands and
rises because it is less dense when the
gas or liquid cools it becomes denser
and falls as the gas or liquid warms
arises or cools and falls it creates a
convection current which is what
transfers the heat from one place to
another for example if you turn on your
radiator despite the name the room is
heated by convection as the air is
heated above the radiator it expands
rises and the cooler denser sinks
causing a convection current around the
room
you
substances that are in direct contact
with each other and it mainly happens in
solids the heat is conducted from atom
to atom using a kinetic energy of the
particles in other words by vibrating
the best set conductor the more rapidly
heat will transfer have you ever noticed
that metal benches tend to feel colder
than wooden ones believe it or not the
nut colder they only feel colder because
they conduct heat away from your bottom
better than wood and he perceived that
heat leaving your bomb as cold metals
are particularly good at conducting heat
because of their free electrons that
move about the structure colliding with
the positive ions and transferring the
kinetic energy to them convection
happens in gases and liquids as a gas or
a liquid is heated it warms expands and
rises because it is less dense when the
gas or liquid cools it becomes denser
and falls as the gas or liquid warms
arises or cools and falls it creates a
convection current which is what
transfers the heat from one place to
another for example if you turn on your
radiator despite the name the room is
heated by convection as the air is
heated above the radiator it expands
rises and the cooler denser sinks
causing a convection current around the
room
you
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Nov 08, 2024 Last updated |
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