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### College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

# Thermal stresses caused by uneven cooling can easily break glass cookware. Explain why Pyrex®, a glass with a small coefficient of linear expansion, is less susceptible.

Pyrex®, a glass with a small coefficient of linear expansion, is less susceptible because the difference between the expansion in various parts of the cookware is minimum. These are made of borosilicate, which has higher thermal resistance makes them better for cooking work

See the step by step solution

## Step 1: Thermal expansion and stress

Thermal expansion is the increase or decrease of the body when there is a temperature change. And a constrained normal expansion creates thermal stress.

Thermal stress is the defect or internal reallocation of forces within an object due to a significant temperature variation. A thermal distribution may or may not be invariant, depending on the nature of the loading condition.

## Step 2: The coefficient of linear expansion

The coefficient of linear expansion is related to a change in a shape or dimensions of a solid body with a temperature change. When heat is applied to glass cookware it expands because it is a good conductor of heat and it tends to break easily.

Here, we are discussing Pyrex glasses. These are tempered glass and have more strength. And the glass with a small coefficient of linear expansion is less susceptible to breaking due to the difference between the expansion in a different part of the cookware is minimum.