Ring and Ball Apparatus
Product Code : JL-LEP-10422
The Ring and Ball Apparatus (SKU JL-LEP-10422) demonstrates thermal expansion and contraction of a metal with a brass ball of 25.00 mm that just passes through a brass ring of 25.04 mm when both are cold. When the ball is heated it no longer fits, and when it cools it passes again. The ring and ball apparatus has a wooden handle and a stainless steel chain that keeps the ball captive. JaincoLab manufactures it in India.
Specifications
The apparatus has a smooth brass ball of 25.00 mm (±0.01 mm) and a smooth brass ring of 25.04 mm (±0.01 mm) inside diameter, at least 38 mm outside and 6 mm thick, on a 5 mm brass stem with a wooden handle, the ball held captive by a stainless steel chain and wire ring.
| Product | Ring and Ball Apparatus |
| SKU | JL-LEP-10422 |
| Purpose | Demonstrates thermal expansion and contraction of a metal |
| Construction | Captive brass ball secured to a mounted brass ring by a chain |
| Ball diameter | 25.00 mm ±0.01 mm, smooth surface |
| Ring inside diameter | 25.04 mm ±0.01 mm, smooth surface |
| Ring outside diameter | 38 mm minimum |
| Ring thickness | 6 mm minimum |
| Stem | Brass, 5 mm diameter |
| Handle | Wooden handle on the ring |
| Chain | Stainless steel, with a 3-turn stainless wire ring to keep the ball secure during heating |
| Specification reference | As per DepEd guidelines |
Applications of the ring and ball apparatus
The teacher passes the cold ball through the ring, heats the ball in a flame and shows that it will no longer pass, then lets it cool or heats the ring instead, making the expansion of solids visible to the whole class.
- Showing that a metal ball expands when heated and no longer passes through the ring
- Showing contraction as the ball cools and passes through again
- Heating the ring instead to show that the hole in the ring also expands
- Discussing expansion gaps in rails, bridges and pipes
- Thermal expansion lessons in secondary science and physics
Scope of supply and ordering
The listing covers the brass ball and ring with stem, wooden handle and chain as described in the specification table. Burner and quantities are confirmed on the quotation.
MOQ, lead time and packing are stated on the quotation for the number of sets and the delivery destination. JaincoLab supplies physics laboratories, school groups and export buyers in Africa, the Middle East and South and South-East Asia.
Frequently asked questions
What sizes are the ball and ring?
The ball is 25.00 mm (±0.01 mm) and the ring’s inside diameter 25.04 mm (±0.01 mm).
What are they made of?
Both are brass; the ring has a 5 mm brass stem and a wooden handle.
Is the ball attached?
Yes. It is held captive by a stainless steel chain with a 3-turn wire ring.
What does the apparatus demonstrate?
Thermal expansion and contraction of a metal.
Related products
Heat apparatus often ordered with the ring and ball:
- Coefficient of Linear Expansion
- Heat Conductivity Apparatus
- Burner Bunsen
- Convection Tank (Thermocline Apparatus)
More heat and thermal physics apparatus is listed in the Laboratory Equipment Products range from JaincoLab, a physics lab equipment manufacturer in India.
Request a quote
For a quotation on the Ring and Ball Apparatus, send the number of sets and the delivery destination through the JaincoLab contact page or email [email protected]. Buying under a laboratory tender? Use our tenders page.
