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Zeroth law of thermodynamics and why do we need it ?

## Zeroth law of thermodynamics and why do we need it ?

The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other. Accordingly, thermal equilibrium between systems is a transitive relation. (if A =B and B=C, then C=A) The fact that temperature obeys a transitive property is by no means intuitive! If A likes B; B likes C; Does not imply that A likes C. The city closest to city A is B, the…

Buoyancy

## Buoyancy

Useful Preliminaries : $\rho = \frac{m}{V}$ $w = mg = \rho Vg$ $p = \frac{F}{A}$ $p = p_0 + \rho g h$ Pressure depends on depth: In a tank filled with a fluid, the bottom most part of the tank experiences a higher pressure than the top most part of the tank. This is simply because if you are at the bottom, there are more layers of the fluid above your head “weighing you down”…