Bar and Gauze Apparatus Aluminium
Product Code : EL-H-10396
Quick answer: The Bar and Gauge Apparatus (aluminium) shows that solids expand when heated and contract when cooled. The cold aluminium bar fits the U-shaped metal gauge; after heating it no longer fits, and it slides in again once it cools. Both parts have insulated handles. Lab Exports manufactures it in Delhi for schools and colleges.
Specifications
| Item | Specification |
|---|---|
| Bar | Aluminium, mounted on a rod with insulated handle |
| Gauge | U-shaped metal gauge on an insulated handle |
| Handles | Insulated, on both bar and gauge |
| Principle demonstrated | Expansion on heating, contraction on cooling |
| Category | Physics Lab - Heat |
How the bar and gauge experiment is done
The bar and gauge experiment demonstrates linear expansion in a way students can check by hand. At room temperature the aluminium bar fits exactly into the U-shaped gauge. Heating lengthens the bar, so it will no longer enter the gap; on cooling it shortens again and fits once more. Aluminium suits the demonstration because its coefficient of linear expansion, about 23 x 10^-6 per deg C, is among the higher values for common metals.
- Show that the cold bar fits into the U-shaped gauge.
- Heat the bar in a flame, holding it by its insulated handle.
- Try the bar in the gauge again; it is now too long to enter.
- Let the bar cool, or dip it in cold water, and show that it fits once more.
Used after the ball and ring experiment, it moves the lesson from expansion in all directions to expansion along a length, preparing students for the linear expansion coefficient alpha = delta L / (L x delta T).
Key features
- Two-part set: aluminium bar and matching U-shaped metal gauge
- Insulated handles on both parts for safe handling while hot
- Shows expansion on heating and contraction on cooling in one reversible demonstration
- Immediate result, visible to the whole class
- Complements the ball and ring apparatus in heat practicals
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the bar and gauge apparatus at its works in Laxmi Nagar, Delhi, and supplies it to schools and colleges in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Heat products
- Ball and Ring Apparatus (EL-H-10395)
- Pyrometer (EL-H-10397)
- Linear Expansion Apparatus (EL-H-10398)
- Searle's Thermal Conductivity Apparatus (EL-H-10399)
- Lee's and Charlton's Apparatus (EL-H-10400)
- Joule's Calorimeter (EL-H-10401)
The full range is in the Heat section of the Physics Lab range.
Frequently asked questions
What does the bar and gauge apparatus demonstrate?
Expansion of a solid on heating and its contraction on cooling. The bar fits the gauge when cool, fails to fit after heating and fits again once it has cooled.
What is the bar made of?
The bar is aluminium and the U-shaped gauge is metal. Both are mounted on insulated handles.
What is the price of the bar and gauge apparatus?
Prices are not published on the website. Add the bar and gauge apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-H-10396 and the quantity, to receive a quotation.
Does Lab Exports manufacture the bar and gauge apparatus?
Yes. Lab Exports manufactures the bar and gauge apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-H-10396.
Request a quote
Email [email protected] with the house code EL-H-10396 and the quantity, or add the bar and gauge apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
