Cambridge Secondary (7-9). Stage 9. MCE Science. Workbook - Unit 10: Transfer of Thermal Energy - Question 21

Place a smaller clay pot inside a larger clay pot. Fill the space between the pots with sand. Pour water into the sand until it is moist. Place a thermometer inside the smaller pot. Cover the whole set-up with a damp cloth.



What is the purpose of the sand between the pots?