Convection
by-Stavya, Maira, Aditi, Abdul, Aarav
DEFINITIONS
CONVECTION
When the liquid or gas is
heated the particles at the
bottom start to move fast
and take more space then
these particles will become
less dense and start to flow
up through the colder or
more dense particles. This
upward movement of
warmer liquid or gas is
called convection.
CONVECTION CURRENT
the cold or more dense
particles of the liquid or gas
will sink down to occupy the
space these particles are now
closer to the source of heat
and get heated then these
particles occupy more space
and start to float. This
movement around the heated
liquid or gas is called
convection current.
IMPOTANT POINTERS:
convection current is the reason of all the liquids or
gases being heated.
convection can happen in liquids and gases because
the particles are free to move . Convection cannot
take place in a solid as the particles are not free to
move and the particles of a solid can only vibrate
about fixed positions
convection cannot take place in a vacuum as the are
no particles to move
Example of convectional current
THE COOKING PAN IS HEATED ONLY AT THE BOOTOM, BUT THE
CONVECTION CURRENTS IN THE WATER HEAT ALL OF THE
WATER
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