The way in which a material cools down or warms up is of great interest to scientists. Investigating cooling can lead to useful information about materials which can keep us warm or materials which stop us from burning ourselves when using hot objects eg. in the kitchen.
The following graphs have been drawn from the results of ‘cooling investigations’.
Hot water has been allowed to cool down and the temperature has been recorded every 5 minutes for up to 2 hours
Each dot or point on the graph tells us the temperature after a certain time in the experiment.
The temperature of the water is 60 degC at the start but gradually drops to about 25 degC and then the temperature remains the same (constant temperature).