A company has made a new material called ‘Wellwarm’. They want to use ‘Wellwarm’ to make coats. (a) A scientist tested ‘Wellwarm’ to see how well it insulated a beaker of hot water. She tested ‘Wellwa

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A company has made a new material called ‘Wellwarm’. They want to use ‘Wellwarm’ to make

coats.

(a) A scientist tested ‘Wellwarm’ to see how well it insulated a beaker of hot water.

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She tested ‘Wellwarm’ and three other materials as shown below.

material A material B material C material D

She wrapped each beaker in a different material.

She recorded the temperature at the start and 20 minutes later.

1.

(i) What was the independent variable that the scientist changed?

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