If a glass part with a wall thickness of 5 mm (0.20 in) takes 10 minutes to anneal, how much time would a glass part of similar geometry but with a wall thickness of 7.5 mm (0.30 in) take to anneal (choose the one closest answer):

Question

Quizplus · Accepted Answer

The rule is that annealing time varies as the square of the wall thickness.That would indicate an annealing time of (0.30/0.20)² = 2.25 times 10 minutes or 22.5 minutes.20 minutes is closest.

If a Glass Part with a Wall Thickness of 5