Thermodynamics ...

The temperature of the system decreases in the process of 

The object under thermodynamical study is called

Assertion (A) : Two systems which are in thermal equilibrium with a third system, are in thermal equilibrium with each other.
Reason (R) : The heat flows always from a system at higher temperature to a system at a lower temperature.

For an adiabatic change in a gas, if P, V, T denotes pressure, volume and absolute temperature of gas at any time and $$\gamma $$ is the ratio of specific heats of gas, which of the following equation is true?

The law obeyed by isothermal process :

The laws of thermodynamics speak about

First law of thermodynamics states that :

In an open system, system and surroundings can exchange

Assertion (A) : According to the principle of conservation of energy all heat can be converted
into mechanical work
Reason (R) : Due to various losses, it is impossible to convert all heat into mechanical work.

If a monoatomic gas is suddenly compressed to $$\dfrac{1}{8}$$ of its volume adiabatically, then the pressure of the gas is