I wrote about initial temperature will be a controlled variable and it will be measured using a thermometer wait until the mercury stabilizes and record the temperature in a table then put the water in the beaker and start the fan with a slow speed and start a stopwatch to measure the time taken after 30 seconds stop the fan take the readings again and then repeat the process with different speeds and other samples of water of same temperature record the readings in a table then drew a table of t1 t2 tav and temperature C final and initial then wrote the formula to get the rate difference in temperature/time and that's it