Specific Heat Capacity and Relation Between Cp and Cv Video Lecture - NEET

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thermodynamics part 16 is got you by
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15 different topic in thermodynamics
heat traps what does he cast why do we
need heat callused before we define heat
capacity let me talk why do we need
cancer do you know what we have learners
changes internal energy of the system
that is Q plus W he throws we told that
Delta you change in internal energy Q
plus W Q is the heat flow so ever you
are giving heat to a system we want to
know how much heat we have given how to
find the heat we have like how do we
measure the transferred heat or system
we have given some heat how do you
measure how much heat has been
transferred whether 10 30 40 we don't
know how to measure you need some see
you all living in this earth I easily
just we have missing class together
temperature also we can measure but he
is not temperature heat is heat flow it
is heat flow hard to be measured he
correctly understand this heat flow or
heat is not admission and which is
definitely measured from thermometer he
flow is something different so the
question is how should we winter
basil heating so experimentally they
have seen that he flow or he transferred
is directly proportional to the change
in temperature let someone reached the
flask was initially at 10 degree Celsius
initially and we be heated Ness with
small fire and became Queen degree
Celsius the same we had two flowers like
that and now the flask his clasp on this
glass tube was heated to be the bigger
fire and we have already researchers so
it is observed and then they this is
what heat we are sending or heat we are
transferring which we got measured norm
but we will try to find a way to measure
but we saw that the heat transfer is
directly proportional to the temperature
difference right this Q is that you know
the impact that is something which we
know by experiment right the heat
transfer is directly proportional to the
temperature difference given on the
flask as same properties same masses
immunity is seen similar you shouldn't
ask the temperature difference is
backing hook should become heat more
heat to transfer the more than
everything the less if you transfer the
lesser than temperature difference
initially was 10 so here delta T was 10
and here it redeems further as you wish
let's check if you see delta T is more
here it also observed the coefficient
depends on size composition and Leisha
resistor so or same delta T let's
suppose I'm just telling that if you
have smaller flash and if you're bigger
glass in giving same he this will have
less increase in addition this is not
morning David
so saving it start pretending Celsius
this may end up having good cleaning in
Celsius soluble so for defending Celsius
and this may have end up high fittingly
so here in 30 will be by degree Celsius
and here delta T will be notified you
just some figures I'm throwing so that
means these coefficient is something
which depends on the composition in
nature of the system see first thing we
saw that the heat transfer is actually
proportional to temperature difference
and since it directly proportional we
have some proportional constant noise
and then experiment is a form under this
this property in constant is depending
of the system nature right if it is you
have more bigger system the smaller
system so there are all parameters
always this coefficient
so as I entered this phone
experimentally that does co-efficiency
is directly proportional to the amount
of substance and there is a new term
called molar heat capacity there is a
introduced that is nothing but heat
capacity for one word since we have seen
that this value heat capacity is
depending on the quantity is extensive
property so example temperature is
intensive it doesn't matter on the
quantity so we don't have something
called molar temperature we don't have
right you take the any sample from the
customer to be having same temperature
but since this heat capacity is
dependent on the amount of substance in
system or it is a stencil property you
have something called marine capacity
nothing but the heat capacity of one
mole of substance so that is nothing but
the heat capacity by total number of
moles that gives you the molar heat caps
so Shane of thing where it depends on
the total number of the quantity of
system we generally have something
called molar or a volume molar heat
capacity and things like that so here on
the we have a look on the rate capacity
value is C by n then we have something
more specific heat capacity so till now
we have learn heat capacity then we have
learned moderate capacity
now we learn specific accounts so what
is specific account so if you see it is
nothing but the heat required to raise
temperature of one unique mass by one
degree Celsius or Kelvin again think
because delta T is same doesn't matter
if it is Kelvin or Celsius so it is one
unit mass and one claim is just it was
defined to make things generalize
whether we can have these rattles to get
somewhere the tabular fashion because
samurais don't work you talk about delta
T is 1 and the mass is 1 and this is
small C is Big C specific heat is small
C Big C so the formula we have got three
formulas now the first formula is Q heat
is nothing word specific heat capacity
since per unit mass so you have to
multiply with the number of mass into
delta t by delta T because this was for
1 degree Celsius and you have to
multiply with the number of change in
the number of change in temperature
other formula is Q is equal to C into T
the C is nothing but the heat capacity
that takes care of everything and that
is this is not standardized and because
this C depends on the number of moles
the system the property this is not a
thing so there is no specific standard
value of this or if you want in the
molar form then Q is CM it's little bit
stand right in the number of moles you
make you make you get heat capacity hope
you understand the three formulas the
first one is the specific heat capacity
the most general one so there you have
to multiply with the unit mass delta T
and this is also a little bit use that
is they use the molar heat capacity it
is number of moles you do end up
let's find a relationship between CP and
CV that is a heat capacity this is heat
capacity at constant pressure and
constant volume for a ideal yes so at a
constant volume the heat capacity is C D
as I told you and a constant pressure
the heat capacity is CP right so you see
at constant volume we talked about Delta
U right change internal energy and
change the inner is nothing but QV heat
supply in constant volume and now we
have the form log for the ways to get
this measure this heat supply in terms
of CBN's I think this is CV delta T
right
similarly constant pressure we have
something called enthalpy change and
then in that which is nothing but heat
supply at constant pressure and there is
only one CP delta T all right these
things will this became clue that CP
minus CV is when you are how can we do
that see the formula you know that as
Delta H is equal to Delta u plus delta T
we do not know whether pressure is
changing or volume is changing right PV
is equal to NRT and let's assume
everything for one mole of gas so this
becomes 1 so PV is going to R T so this
becomes Delta u plus Delta R T so R is
constant so this becomes Delta HV
comes Delta u + R Delta okay so Delta H
is what then that is CP delta T CP delta
T is equal to Delta U is what CP delta T
CP delta plus R Delta Delta D is common
everywhere so I can say that CP minus CV
is good and then he what I am so heat
capacity at constant pressure minor heat
hall capacity at constant volume is
almost ending this is good relationship
between the heat capacity at constant
pressure constant so please note here is
a the change in internal energy is on
the word heat supplied at constant
volume change in enthalpy is nothing but
we supplied at constant pressure
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