BAR AND GUAGE
To illustarate expansion of metal on heating and contraction on cooling, with steel bar of length 100 x 10mm and plated brass gauge with a cut-out to just accommodate the bar and two holes through which the bar passes when cold.
To illustarate expansion of metal on heating and contraction on cooling, with steel bar of length 100 x 10mm and plated brass gauge with a cut-out to just accommodate the bar and two holes through which the bar passes when cold.