In the space shuttle, o-rings provide the gas-tight seal needed between the vertically. stacked cylindrical sections that make up the solid fuel booster by building up a stress to counteract the pressure of the escaping super-heated gas. A typical space shuttle o-ring material is Viton, a fluoroelastomer, which can sustain 3 GPa stress at 85% elongation at 25 C. On the day of the ill-fated Challenger launch, the temperature dipped to -2 C. Estimate the change in elongation that would have to be generated by Viton to resist 3 GPa pressure at that temperature.