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Bar & Gauge Apparatus
Bar & Gauge Apparatus (Product Code: SLE/PHY/135) is a heat-expansion demonstrator used to test an iron bar against a brass gauge before and after heating, in school and college physics labs. The gauge has a cut-out that barely admits the cold bar lengthways and a hole that passes it endways only while cold, so a heated bar visibly fails both checks. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Key Details
| Parameter | Detail |
|---|---|
| Bar | Iron, mounted on a support rod with a wooden handle |
| Gauge | Brass, with a lengthways cut-out and an endways hole |
| Fit when cold | Cut-out barely admits the bar lengthways; hole passes the bar endways |
| Fit after heating | The heated bar is compared with the gauge to show that it has expanded |
| Demonstrates | Expansion by heating and contraction by cooling |
| Product code | SLE/PHY/135 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Bar and Gauge Used For?
Because the gauge checks the bar in two directions, the bar and gauge shows students that heating makes a solid grow in length and in thickness at the same time. A typical sequence is to test both fits while the bar is cold, heat the bar in a Bunsen flame, show that it no longer enters the cut-out or the hole, and then cool it and show that it fits again.
Many schools group it with a ball and ring and a bimetallic strip as a simple heat energy science kit for the thermal-expansion lesson. Hold the apparatus only by the wooden handle, never force a hot bar into the gauge, and rest the heated iron on a heat-proof mat while the class discusses the result.
OEM Manufacturer
Jain Scientific Equipments Private Limited, which trades as ScienceLab, is the original equipment manufacturer (OEM) of the Bar & Gauge Apparatus. Each unit is built at the company's own licensed factory at Saha, Ambala, Haryana, India, so buyers deal with the maker directly instead of a reseller. Schools, colleges, institutions, dealers and importers can ask us about repeat orders and replacement gauges or bars. Company background is on the ScienceLab profile page.
Related Physics Lab Equipment
Pair the bar and gauge with these items for a complete expansion practical:
- Apparatus Bar & Gauge — a companion bar-and-gauge model whose listing gives bar and gauge dimensions.
- Ball & Ring Apparatus — the same principle shown with a brass ball and ring.
- Bar Compound Copper & Iron — a two-metal bar that bends when heated, showing the thermostat principle.
- Bunsen Burner with Stopcock — heat source with gas-flow control for warming the bar.
More heat and mechanics apparatus is listed under Physics Lab Equipment.
Frequently Asked Questions
What is included with the Bar & Gauge Apparatus?
The Bar & Gauge Apparatus consists of an iron bar mounted on a support rod with a wooden handle, and a brass gauge with a lengthways cut-out and an endways hole. A burner or other heat source is not listed as part of the apparatus.
How does the Bar & Gauge Apparatus show thermal expansion?
In the Bar & Gauge Apparatus, the cold iron bar just fits the gauge's cut-out lengthways and passes through its hole endways. After heating, the expanded bar no longer fits, and once it cools it fits again, showing expansion by heating and contraction by cooling.
What are the dimensions of the Bar & Gauge Apparatus?
The listing for the Bar & Gauge Apparatus (SLE/PHY/135) does not state bar or gauge dimensions. If your syllabus or tender specifies sizes, send them through the contact page and we will confirm the dimensions of the unit we quote.
Can the bar of the Bar & Gauge Apparatus be cooled in water?
Yes, the heated iron bar of the Bar & Gauge Apparatus can be cooled in air or dipped in cold water to show contraction more quickly. Keep the wooden handle out of the water and dry the iron thoroughly afterwards, because wet iron rusts.
Who manufactures the Bar & Gauge Apparatus?
The Bar & Gauge Apparatus is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory at Saha, Ambala, Haryana, India. Quotations, repeat orders and spare-part requests are handled directly by the manufacturer.
What details should a Bar & Gauge Apparatus enquiry include?
A Bar & Gauge Apparatus enquiry should give the product code SLE/PHY/135, the number of units, the delivery location and any other heat-expansion items you need. Institutions and importers can list everything in one enquiry for a combined quotation.
Request a Quote
For a price on the Bar & Gauge Apparatus, write to us through the contact page or place it in the enquiry cart. You receive the quotation straight from the manufacturer.
Last updated: 24 September 2026
