angelinam31
Answered

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Casey wants to determine whether the rate at which melted glass cools affects the strength of the glass. He pours melted glass into a form and cools the glass at different rates. Then, he tests the breaking strength of each form. Which of the following is the test variable in this experiment?

A. type of glass
B. strength of the glass
C. thickness of the glass
D. cooling rate of glass

Help if you know and are sure!

Sagot :

answer is B
test variable is what you measure
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