How do delta H and q differ in thermodynamics?

[sachin123]

what is the difference between delta H and q?
delta H = delta U + P(delta V)
so,
delta H = delta U -W

delta U=q + W
so,
q=delta U - W

So now is there a difference between the two at all?
Why then 2 separate quantities?
Thank You

 

[Mapes]

delta H = delta U + P(delta V)

You fixed P to get this expression, so you're no longer looking at the most general case. Does this help answer your question?

 

[sachin123]

Yes it does.
So only when the pressure is kept constant,the heat absorbed will become equal to the enthalpy change right?
Thanks Mapes