Absorption And Adsorption Video Lecture | Mass Transfer - Chemical Engineering

absorption and adsorption
some tea accidentally falls while you're
studying what is the best way to remove
it off immediately click on the right
option
yes
now watch the tissue paper suck away the
spill liquid quickly if we had used
ordinary paper the tea would not be
completely absorbed
tissue paper absorbs the liquid and
ordinary paper and solves a liquid how
are these two different let us learn
more on them
let's understand absorption and
adsorption a little better
absorption is the passage of one
substance into or through the bulk of
another medium the absorbed substance
spreads to saturate the whole of the
medium to form a solution the mixing
with the other mediums environment is so
well that one fails to recognize its
existence as a separate entity
in contrast what happens during
adsorption adsorption is the addition or
sticking together of molecules of a gas
liquid or dissolved solids to the
surface of a solid or sometimes a liquid
the molecules are loosely held by the
surface and can easily dropped off
let's see the difference between these
processes absorption is seen in calm day
examples perfume spray is absorbed by
asking crisp fingertips turn soggy
because they have absorbed moisture from
the air one substance is well soaked
into a different medium
what about adsorption here is a jar
containing a red dye dissolved in water
look what happens when a solid pellet of
carbon is dropped into the jar
well isn't that surprising the red color
has almost disappeared in the jar why
the charcoal pellet has minut pores on
its surface that caused the colored
particles stick to it the red dye
undergoes the process of adsorption
shake or warm this jar and low you get
back the red color adsorption can be
easily reversed by simple heating and as
transitory when a substance is absorbed
in a different medium
it's called absorption usually
absorption cannot be reversed by simple
means although it may also be temporary
now let's focus on adsorption by carbon
and some practical applications we could
use adsorption for such diverse things
like in deodorizing air in a
refrigerator decolorizing sugar solution
and controlling excessive acidity
activated charcoal in a gas mask
attracts toxic gas molecules allowing
the person wearing the mask to breathe
fresh air drag the carbon pellet to each
of the units displayed here one by one
and observe the reactions that take
place
you
identify whether a solid or liquid or
gas is adsorbed by carbon in all these
cases
you