Thermal Expansion Apparatus, Bar and gauge device shows expansion due to heating and contraction due to cooling., Each

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At normal temperature, the bar's length fits into the gauge's jaw and the bar's diameter fits into its hole. When the bar is heated, it fits neither jaw nor hole.Simple apparatus is made of a mild-steel bar, 4.3L × 0.4 in. dia. (110 × 10mm), on a wooden-handled rodMetal cast gauge slides over the ends of the bar0.4 in. (10mm) bore in one arm to show expansion in diameterHeating expands bar length to prevent fit into gaugeOverall length: 11 in. (280mm)