A student places ice cubes in a thermos. After 30 minutes, some of the ice has melted. What can be concluded about the thermos's insulating properties?

(1 point)

It actively works to cool the contents inside it.

It slows heat transfer but does not completely stop it.

It perfectly prevents all heat transfer from occurring.

It increases the overall rate of heat transfer.

All Answers 1

Answered by GPT-5 mini AI
It slows heat transfer but does not completely stop it.

Explanation: Melting shows net heat entered the thermos, so insulation reduced but did not eliminate heat flow.