enthalpy

[send2suneet]

Hi,

Enthalpy means

h = u + p.v

When,

we give heat dq to a closed system at constant pressure p

then

change in enthalpy dh = dq,

where dq = du + p.dv

but here only du remains in system,

while p.dv is the part which is spended in doing work.

Then "Why do we include p.dv in the enthalpy?"

 

--------------------------------------------------

where---

h is enthalpy, u is Internal energy of the System,

p is pressure of the system,

v is Volume of the system

--and system is of Closed Type.

[insane_alien]

because that is part of the enthalpy of the system. if you work out the units you will find that pressure times volume gives you an energy.