place a small beaker inside a larger beaker
use a kettle to boil some water
transfer 80cm3 of the hot water into the small beaker
place a cardboard lid on the large beaker
place a thermometer through the cardboard lid
record starting temperature of the water & start a timer
record the temperature of the water every 3 mins for 15 mins
repeat experiment using the same volume of hot water, this time using an insulating material to fill the gap between the two beakers
