An interstate highway is made of concrete slabs 25 m long placed end to end. (a) What expansion gap must be left between the slabs to prevent buckling when the temperature changes from 20 oC to 50 oC? (b) Starting with the gap calculated in part (a), find the gap when the temperature decreases to -20 oC.

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Q: at heat transfer

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Maxwell speed distribution

Maxwell-Boltzmann distribution or commonly known as Maxwell speed distribution, explains the division of the energy levels of the molecules of an ideal gas on the basis of the statistical theory. In 1859, Scottish physicist James Clerk Maxwell established the context for the distribution of molecular velocities for random molecules moving in a closed environment. This theory was generalized in 1871 by German physicist Ludwig Boltzmann. He improvised the theory to express the distribution of energy levels among different molecules.