A Carnot engine operates between 400 K and 300 K. Its efficiency is:

The work done by a gas in an isobaric expansion from $V_1$ to $V_2$ at pressure $P$ is:

For an adiabatic process, $PV^{\gamma} = $ const. For a monatomic ideal gas, $\gamma$ equals:

In an isothermal process for an ideal gas:

According to the Stefan-Boltzmann law, the power radiated by a black body is proportional to:

Most good thermal conductors are also: