Unit 5 · Weakening Arguments
Solid Glass Debate — Weaken the Argument
Lesson 9 of 9
About this lesson
The argument says medieval glass is thicker at the bottom because glass flows very slowly over centuries. One option introduces ancient glass from Egypt and Greece — which is far older — that shows NO thickening at the bottom. If glass truly flows, older glass should show the effect more, not less.
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Question
‘Solid’ glass can actually be better described as a slow-moving liquid. The particles in glass can move, just like in a regular liquid, because they are not fixed in an orderly structure. In glass, this movement is so slow that it cannot be detected during a person’s lifetime or even over the course of several generations. Medieval window glass which has survived to the present day is often found to be thicker at the bottom than at the top. This clearly shows that glass flows.
Which one of these statements, if true, most weakens the above argument?
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