Bar and Gauge
Product Code : JA-PLE-4231
The Bar and Gauge (SKU JA-PLE-4231) illustrates the expansion of a metal on heating and its contraction on cooling. A mild steel bar on a rod with a wooden handle fits its cast metal gauge exactly when cold; after heating in a flame it no longer fits, and it fits again once it has cooled. This bar and gauge expansion apparatus is a standard demonstration in school science lessons on heat.
Specifications
The apparatus is a 110 x 10 mm mild steel bar on a rod with a wooden handle, about 280 mm long overall, and a cast metal gauge that is a sliding fit over the ends of the bar and has a 10 mm bore hole in one arm.
| Product | Bar and Gauge |
| SKU | JA-PLE-4231 |
| Bar | Mild steel, 110 x 10 mm (length x diameter) |
| Handle | Rod with wooden handle |
| Overall length | Approx. 280 mm |
| Gauge | Metal casting, sliding fit over the ends of the bar |
| Gauge hole | 10 mm bore in one arm |
| Purpose | Illustrating expansion by heating and contraction by cooling |
Applications of the bar and gauge expansion apparatus
The bar and gauge gives a clear yes-or-no result that a whole class can see: the cold bar slides into the gauge and through the 10 mm hole, but after heating it is too long and too thick to fit until it cools again.
- Demonstrating linear expansion of a metal bar on heating
- Demonstrating expansion in thickness with the 10 mm gauge hole
- Showing contraction of the bar as it cools
- Introducing expansion gaps in rails, bridges and pipelines
- Class 6-9 science and physics lessons on heat
Scope of supply and ordering
The listing covers the mild steel bar with rod and wooden handle and its cast metal gauge. A burner or other heat source is a separate item.
Frequently asked questions
What size is the bar?
The mild steel bar is 110 x 10 mm, mounted on a rod with a wooden handle, about 280 mm long overall.
How does the gauge show expansion?
The gauge is a sliding fit over the ends of the cold bar and has a 10 mm hole; after heating the bar no longer fits either.
Related products
See more heat apparatus in Physics Lab Equipments from JaincoLab, a physics lab equipment manufacturer in India.
Request a quote
To order the Bar and Gauge, send the quantity and delivery destination through the JaincoLab contact page or email [email protected]. Institutions and contractors buying under a tender can also reach us via the tenders page.
