Mini-Quiz: Thermos Container Uses Thermal Insulation

1. What makes a material a good thermal insulator?

   It conducts heat by conduction, convection and radiationSorry, not correct. Try another button. It barely allows heat to move through it by conductionThat is correct. You understand thermal energy. It is made of silverGood try, but not right. Select another answer.

2. Why must the cap be made of insulating material?

   Otherwise heat would escape through the capCorrect. You understand about the thermos! To prevent dirt from getting inside the thermosOops! Wrong answer. Re-read the question and try again. No one really knows the reason for thatSorry, not correct. Try another button.

3. Why is the inside of a vacuum thermos silvered?

   Silver is one of the best thermal insulatorsSorry, not correct. Try another button. To prevent the vacuum from escapingGood try, but not right. Select another answer. To prevent heat transfer by radiation through the vacuumThat is correct. You understand thermal energy.

Pick an answer to see instant feedback. Re-read the lesson if you miss one.