Bar and Gauge Apparatus Manufacturer,Supplier and Exporter in India

Bar and Gauge Apparatus

Product Code : EL-H-10689

Quick Answer: The Bar and Gauge Apparatus illustrates expansion by heating and contraction by cooling with an iron bar on a handled rod and a brass gauge that the bar fits only while cold.

Last updated: October 2026

Key Features

  • Iron bar mounted on a support rod with a wooden handle
  • Brass gauge with a cut-out that barely admits the bar lengthways while cold
  • Hole in the gauge that passes the bar endways only while cold
  • Shows expansion on heating and contraction on cooling

About This Product

The cold bar just fits the cut-out lengthways and passes through the hole endways. After the bar is heated it no longer fits the gauge, giving a visual demonstration of thermal expansion, and it fits again once it has cooled.

Frequently Asked Questions

How does the Bar and Gauge Apparatus show expansion?

The iron bar fits the brass gauge cut-out and hole only while cold, so after heating it can be compared with the gauge to show that it has expanded.

Related: Heat, Boyle’s Law Apparatus and Conductivity Apparatus.

For a quotation on the Bar and Gauge Apparatus, contact Didactic Lab.


   
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