Whether the system is in an equilibrium state depends on what?

Why is work an extensive quantity?

Who formulated the zeroth law of thermodynamics?

What is heat?

The following three objects $(1)$ a metal tray,$(2)$ a block of wood,and $(3)$ a woolen cap are left in a closed room overnight. Next day,the temperature of each is recorded as $T_1, T_2$,and $T_3$,respectively. The likely situation is:

Can any system possess heat?