# Metal ball and ring

1. Sep 10, 2009

### amanara

There is a metal ball and a metal ring , through which the metal ball can pass easily. But when the metal ball is heated , it can't pass through the metal ring. What will happen if metal ring is heated?(keeping metal ball normal)

2. Sep 10, 2009

### Rajini

generally ring will expand! so ball can pass through

3. Sep 10, 2009

### amanara

but , the ring should also expand inside according to thermal expansion.

4. Sep 10, 2009

### A.T.

No. If the thermal expansion is uniform, it causes an uniform scaling up of all distances, including the inner diameter of the ring. In other words: The ring will keep it's proportions, like the inner radius / outer radius ratio. If the outer radius increases, the inner will do so as well.

5. Sep 10, 2009

### Rajini

what is the clearance between the ball (radius) and ring (radius and thickness!) (both being at room temperature).
Ball and ring made of which metal?

6. Sep 10, 2009

### fawk3s

it doesnt matter since they are both made of the same material.