# Linear Expansion of pyrex

1. Oct 19, 2008

### Lance WIlliam

1. The problem statement, all variables and given/known data

A steel ball bearing is encased in a Pyrex glass cube 1.0 cm on a side. At 390K , the ball bearing fits tightly inside the cube.

At what temperature will it have a clearance of 0.90pico meters all around?

2. Relevant equations
Coefficent of linear expansion:
$$\propto$$ =(Change in L / L) / change in T

Im not sure what my Delta L should be.....
L= .01 m
T initial is 390K
the $$\propto$$ is 3.2e-6

3. The attempt at a solution

I just need delta L in order to solve for T final

2. Oct 19, 2008

### Staff: Mentor

How does the expansion coefficient of Pyrex compare to that of steel?