Why heat is a path function and not state function.?

Question

I need to understand this as to why heat (also work) are considered path function. How do they have inexact integral? Kindly some one explain

Answer 1

Heat is how rapidly molecules are moving - the faster molecules move, the hotter it is, the slower molecules move - the colder it is - it can gradually increase or decrease.

Answer 2

The easiest way to explain this is using a state function as an example:

PV=nRT.

This equation of state gives P(V,T) etc. But, given V1, T1 and some later V2, T1, I can only tell you P1 and P2, but not the ratios of heat and work done by the system to get to this new pressure. That depends on what you do to the system.

Answer 3

think logicallly you will get the answer, heat is transferable from one place to other place,i.e. heat is transferred through a path and in that path the heat level i.e the intensity of heat at different location is varied due to some atmosphere changes that is why it is treated as path function.