Class 7 Exam > Class 7 Videos > Conduction of heat - Heat - CBSE Class 7 Science
Conduction of heat - Heat - CBSE Class 7 Science Video Lecture
FAQs on Conduction of heat - Heat - CBSE Class 7 Science Video Lecture
| 1. What is conduction of heat? |  |
Ans. Conduction of heat is the transfer of heat energy through a substance or between two substances that are in direct contact with each other. It occurs due to the collision of particles within the substance, which leads to the transfer of thermal energy from the hotter region to the colder region.
| 2. How does conduction of heat occur? | |
Ans. Conduction of heat occurs through the process of particle collision. When particles in a substance are heated, they gain kinetic energy and vibrate more vigorously. These fast-moving particles collide with neighboring particles, transferring their energy. This transfer of energy continues throughout the substance until thermal equilibrium is reached.
| 3. What are some examples of conduction of heat in daily life? | |
Ans. There are several examples of conduction of heat in our daily lives. Some common examples include:
- Touching a hot pan and feeling the heat transfer to your hand.
- Placing a metal spoon in a hot cup of tea, where the heat is transferred to the spoon.
- Walking barefoot on a hot sand beach, where the heat is conducted from the sand to your feet.
| 4. How does conduction differ from convection and radiation? | |
Ans. Conduction, convection, and radiation are three different mechanisms of heat transfer.
Conduction: It involves the direct transfer of heat through a substance or between substances in direct contact.
Convection: It involves the transfer of heat through the movement of fluids (liquids or gases). Convection occurs when heated particles move from one place to another, carrying thermal energy with them.
Radiation: It involves the transfer of heat through electromagnetic waves. Unlike conduction and convection, radiation does not require a medium for heat transfer and can occur in a vacuum.
| 5. How can we minimize heat conduction in everyday objects? | |
Ans. To minimize heat conduction in everyday objects, we can use insulating materials that have low thermal conductivity. Some common insulating materials include fiberglass, foam, and wool. These materials have a structure that traps air pockets, which reduces the transfer of heat by conduction. Additionally, using double-glazed windows, wearing thermal clothing, and using heat-resistant gloves can also help minimize heat conduction.
Text Transcript from Video
conduction of heat this video talks
about the conduction of heat let's
perform an activity to understand the
conduction of heat take a straight and
flat rod of aluminum or iron to fix some
nails using wax fix the rod to a stand
now heat the other end of the rod with a
spirit lamp absorb the order in which
the nails drop down the nail near the
spirit lamp falls down first followed by
its nearest neighbour and so on the one
near the stand falls down last the heat
supplied by the spirit lamp flows to the
other end of the rod by conduction
we know that in solids molecules are
closely packed touching one another when
heat is supplied to one end of the rod
the molecules absorb the heat and begin
to vibrate vigorously these vibrations
are passed on to the neighboring
molecules and make them also vibrate
this phenomenon is repeated throughout
the length of the rod in this way the
heat energy gets transferred from the
hot region to the cold region
transmission of heat in solid substances
takes place through conduction for the
conduction to take place from the hot
portion of the body to the cold part of
it or from the hot body to the cold body
the two parts should be in contact with
each other when the temperatures of
these bodies are equal the flow of heat
through conduction process stops we can
observe this phenomenon while using a
thermometer when the bulb of the
thermometer touches a hot substance the
mercury absorbs the heat and it expands
when the temperature of the tip of the
thermometer and the substance are equal
no transfer of heat takes place so the
level of mercury does not increase
further two conditions are to be
fulfilled to transfer heat from one
object to another by conduction they are
one the two objects must be touching
each other two there should be some
difference in the temperature of the two
objects heat transfers from the object
at a high temperature to the other which
is at a low temperature when a teaspoon
is put in a cup of hot water these two
conditions are
build water and the spoon are touching
each other
the temperatures are different so the
cold spoon absorbs the heat from the hot
water and so it's temperature rises
about the conduction of heat let's
perform an activity to understand the
conduction of heat take a straight and
flat rod of aluminum or iron to fix some
nails using wax fix the rod to a stand
now heat the other end of the rod with a
spirit lamp absorb the order in which
the nails drop down the nail near the
spirit lamp falls down first followed by
its nearest neighbour and so on the one
near the stand falls down last the heat
supplied by the spirit lamp flows to the
other end of the rod by conduction
we know that in solids molecules are
closely packed touching one another when
heat is supplied to one end of the rod
the molecules absorb the heat and begin
to vibrate vigorously these vibrations
are passed on to the neighboring
molecules and make them also vibrate
this phenomenon is repeated throughout
the length of the rod in this way the
heat energy gets transferred from the
hot region to the cold region
transmission of heat in solid substances
takes place through conduction for the
conduction to take place from the hot
portion of the body to the cold part of
it or from the hot body to the cold body
the two parts should be in contact with
each other when the temperatures of
these bodies are equal the flow of heat
through conduction process stops we can
observe this phenomenon while using a
thermometer when the bulb of the
thermometer touches a hot substance the
mercury absorbs the heat and it expands
when the temperature of the tip of the
thermometer and the substance are equal
no transfer of heat takes place so the
level of mercury does not increase
further two conditions are to be
fulfilled to transfer heat from one
object to another by conduction they are
one the two objects must be touching
each other two there should be some
difference in the temperature of the two
objects heat transfers from the object
at a high temperature to the other which
is at a low temperature when a teaspoon
is put in a cup of hot water these two
conditions are
build water and the spoon are touching
each other
the temperatures are different so the
cold spoon absorbs the heat from the hot
water and so it's temperature rises
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Nov 15, 2024 Last updated |
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