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9.2 Heat Flow and Thermal Equilibrium (Convection (Heat is transferred by…
9.2 Heat Flow and Thermal Equilibrium
Heat flows from a
hot
object to a
cold
object
Radiation
it's a process of
transferring heat
without any medium.
propagate
through an empty space or vacuum.
Types of surface,
temperature
and total surface area of an object.
Convection
Heat is transferred by the
movement of liquid
The part of the liquid that receives heat will expand become less dense and rise
The colder and more dense fluid moves downwards
The circulating stream that rises and falls continuously is known as
convection current
Conduction
Heat transfer from hotter regions to colder regions through a
SOLID MEDIUM
Particles that receive heat energy will
VIBRATE
and
COLLIDE
with one another more frequently and transfer the heat to the whole medium
Heat Flow in Natural Phenomena
Natural Convection Heat Transfer from a Rectangular Block Embedded in a Vertical Enclosure.
Heat Conductors
Good Conductors
Pure Silver, Pure copper, Pure gold, Aluminium, Zinc, Nickel, Brass, Bronze, Iron, Platinum,Steel,Lead,Stainless steel
Heat conduction (or thermal conduction) is the movement of heat from one solid to another one that has different temperature when they are touching each other.
Heat insulators
Thermal insulation is the reduction of heat transfer between objects in thermal contact or in range of radiative influence.
Thermal Equilibrium
Two objects which are in thermal contact can exchange heat energy between them.
The heat energy is transferred from the object with a higher temperature to the object with a lower temperature
