Book edition 7th

Author(s) Douglas C. Giancoli

Pages 978 pages

ISBN 978-0321625922

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Short Answer

Question 12: The principal virtue of Pyrex glass is that its coefficient of linear expansion is much smaller than that for ordinary glass (Table 13–1). Explain why this gives rise to the higher heat resistance of Pyrex.

Pyrex glass has a much higher heat resistance than ordinary glass because it expands less on heating. Thus, the chances of breaking get reduced.

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Step by Step Solution

TABLE OF CONTENTS :

TABLE OF CONTENTS

Step 1: Linear expansion

Most of the solid substances linearly expand on heating. When the temperature of a solid object of length \({l_0}\) is increased by\(\Delta T\), the length of the object increases by \(\Delta l\) amount.

The change in the length of the object is given as:

\(\Delta l = \alpha {l_0}\Delta T\)

Here, \(\alpha \) is known as the coefficient of linear expansion.

The coefficient of linear expansion of Pyrex glass is \(3 \times {10^{ - 6}}\;{\left( {{\rm{C}}^\circ } \right)^{ - 1}}\), and ordinary glass is \(9 \times {10^{ - 6}}\;{\left( {{\rm{C}}^\circ } \right)^{ - 1}}\).

Step 2: Explanation for the higher heat resistance of Pyrex

The value of the coefficient of linear expansion of Pyrex glass is much smaller than that of ordinary glass. Thus, on heating, the expansion in ordinary glass will be much more than the Pyrex glass. Therefore, when heated rapidly, much higher thermal stress will develop in the ordinary glass, and thus there will be more chances of crossing the breaking stress. So, there are more chances of the ordinary glass breaking as compared to the Pyrex glass when heated rapidly.

Thus, you can say that Pyrex glass will not easily break when heated to a higher temperature. Therefore, the heat resistance of Pyrex glass is much higher than that of ordinary glass.

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Physics Principles with Applications

Answers without the blur.

Short Answer

Question 12: The principal virtue of Pyrex glass is that its coefficient of linear expansion is much smaller than that for ordinary glass (Table 13–1). Explain why this gives rise to the higher heat resistance of Pyrex.

Step by Step Solution

Step 1: Linear expansion

Step 2: Explanation for the higher heat resistance of Pyrex

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A student’s weight displayed on a digital scale is \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\). This would suggest her weight is

(a) within\({\bf{1\% }}\)of\({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(b) exactly \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(c) somewhere between \({\bf{117}}{\bf{.18}}\;{\bf{lb}}\) and \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(d) somewhere between \({\bf{117}}{\bf{.0}}\) and \({\bf{117}}{\bf{.4}}\;{\bf{lb}}\).

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Physics Principles with Applications

Answers without the blur.

Short Answer

Question 12: The principal virtue of Pyrex glass is that its coefficient of linear expansion is much smaller than that for ordinary glass (Table 13–1). Explain why this gives rise to the higher heat resistance of Pyrex.

Step by Step Solution

Step 1: Linear expansion

Step 2: Explanation for the higher heat resistance of Pyrex

Most popular questions for Physics Textbooks

A student’s weight displayed on a digital scale is \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\). This would suggest her weight is

(a) within\({\bf{1\% }}\)of\({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(b) exactly \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(c) somewhere between \({\bf{117}}{\bf{.18}}\;{\bf{lb}}\) and \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(d) somewhere between \({\bf{117}}{\bf{.0}}\) and \({\bf{117}}{\bf{.4}}\;{\bf{lb}}\).

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